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Diseases

Genetic and Rare Diseases Information Center (GARD)

Search for Rare or Genetic Diseases


Diseases Beginning With G

The purpose of the Rare Diseases and Related Terms list is to distribute information; although the list is updated regularly, it should not be used as a reference or guarantee that a condition is rare. The prevalence of a rare disease is usually an estimate and may change over time. A rare (or orphan) disease is generally considered to have a prevalence of fewer than 200,000 affected individuals in the United States.

* This symbol indicates that a condition is not rare but is one for which a question has been answered by the GARD Information Center.

Is Rare Condition? Disease Name
* G syndrome - See Opitz G/BBB syndrome
* G6P translocase deficiency - See Glucose-6-phosphate translocase deficiency
* G6PD deficiency - See Glucose-6-phosphate dehydrogenase deficiency
* GA 1 - See Glutaric acidemia type I
* GA 2 - See Glutaric acidemia type II
* GABA metabolic defect - See Succinic semialdehyde dehydrogenase deficiency
* GABA transaminase deficiency - See Gamma aminobutyric acid transaminase deficiency
* GABAT - See Gamma aminobutyric acid transaminase deficiency
* GABEB - See Junctional epidermolysis bullosa, non-Herlitz type
* Gabrielli syndrome - See Orofaciodigital syndrome 11
* Gaisboeck's syndrome - See Pseudopolycythaemia
* Galactocele
* Galactocerebrosidase deficiency - See Krabbe leukodystrophy
* Galactocoele - See Galactocele
* Galactokinase deficiency
* Galactorrhea amenorrhea without pregnancy - See Ahumada Del Castillo syndrome
* Galactorrhea-amenorrhea syndrome - See Forbes Albright syndrome
* Galactorrhea-Hyperprolactinemia - See Galactorrhoea-Hyperprolactinaemia
* Galactorrhoea-Hyperprolactinaemia
* Galactosamine-6-sulfatase deficiency - See Morquio syndrome A
* Galactose epimerase deficiency
* Galactose-1-phosphate uridyltransferase deficiency - See Galactosemia
* Galactosemia
* Galactosemia 2 - See Galactokinase deficiency
* Galactosemia 3 - See Galactose epimerase deficiency
* Galactosemia, classic - See Galactosemia
* Galactosialidosis
* Galactosylceramide beta-galactosidase deficiency - See Krabbe leukodystrophy
* Galactosyltransferase 1 deficiency - See Ehlers-Danlos syndrome progeroid type
* GALC deficiency - See Krabbe leukodystrophy
* GALE deficiency - See Galactose epimerase deficiency
* Galen vein aneurysm - See Vein of Galen aneurysm
* Galenic arteriovenous malformation - See Vein of Galen aneurysm
* GALK deficiency - See Galactokinase deficiency
* Gall bladder cancer
* Gallbladder, left-sided - See Left-sided gallbladder
* Galloway Mowat syndrome - See Microcephaly, hiatal hernia and nephrotic syndrome
* Galloway syndrome - See Microcephaly, hiatal hernia and nephrotic syndrome
* Gallstone cholecystitis - See Cholecystitis
* GALNS deficiency - See Morquio syndrome A
* GALT deficiency - See Galactosemia
* Gambian sleeping sickness - See Trypanosomiasis, Human West-African
* Game Friedman Paradice syndrome
* Gamma aminobutyrate transaminase deficiency - See Gamma aminobutyric acid transaminase deficiency
* Gamma aminobutyric acid transaminase deficiency
* Gamma heavy chain deposition disease - See Gamma heavy chain disease
* Gamma heavy chain disease
* Gamma-A-globulin, selective deficiency of - See Selective IgA deficiency
* Gamma-cystathionase deficiency
* Gammaglobulin Deficiency - See Primary agammaglobulinemia
* Gamma-glutamyltransferase deficiency - See Glutathionuria
* Gamma-glutamyltranspeptidase deficiency - See Glutathionuria
* Gamma-hydroxybutyricaciduria - See Succinic semialdehyde dehydrogenase deficiency
* Gamma-sarcoglycanopathy - See Limb-girdle muscular dystrophy, type 2C
* Gamstorp disease - See Hyperkalemic periodic paralysis
* Gamstorp episodic adynamy - See Hyperkalemic periodic paralysis
* GAMT deficiency - See Guanidinoacetate methyltransferase deficiency
* GAN - See Giant axonal neuropathy
* GAN1 - See Giant axonal neuropathy
* Gangliocytoma
* Ganglioglioma
* Ganglioneuroblastoma - See Gangliocytoma
* Ganglioneuroma - See Gangliocytoma
* Ganglioside neuraminidase deficiency - See Mucolipidosis type 4
* Ganglioside sialidase deficiency - See Mucolipidosis type 4
* Gangliosidosis generalized GM1 chronic type - See GM1 gangliosidosis type 3
* Gangliosidosis generalized GM1 infantile form - See GM1 gangliosidosis type 1
* Gangliosidosis generalized GM1 juvenile type - See GM1 gangliosidosis type 2
* Gangliosidosis generalized GM1 type 1 - See GM1 gangliosidosis type 1
* Gangliosidosis generalized GM1 type 2 - See GM1 gangliosidosis type 2
* Gangliosidosis GM1 type 3 - See GM1 gangliosidosis type 3
* Gangliosidosis GM2 , type 1 - See Tay-Sachs disease
* GAPDH deficiency - See Glyceraldehyde-3-phosphate dehydrogenase deficiency
* GAPO syndrome
* Garcia-Lurie syndrome - See XK aprosencephaly
* Gardner Morrison Abbot syndrome
* Gardner syndrome
* Gardner-Diamond syndrome
* Gardner's syndrome - See Gardner syndrome
* Gardner-Silengo-Wachtel syndrome - See Genito palato cardiac syndrome
* Gareis-Mason syndrome - See Spastic paraplegia 1
* Garret Tripp syndrome
* GAS - See Streptococcal Group A invasive disease
* Gas bloat syndrome
* Gastric antral vascular ectasia - See Watermelon stomach
* Gastric cancer, childhood - See Stomach cancer, childhood
* Gastric cancer, familial diffuse - See Hereditary diffuse gastric cancer
* Gastric cancer, hereditary diffuse - See Hereditary diffuse gastric cancer
* Gastric duplication cysts
* Gastric leiomyosarcoma, pulmonary chondroma, and extraadrenal paraganglioma - See Carney triad
* Gastric lymphoma
* Gastrinoma - See Zollinger-Ellison syndrome
* Gastrocutaneous syndrome
* Gastro-enteropancreatic neuroendocrine tumor
* Gastroenteropathy, protein losing - See Menetrier disease
* Gastroesophageal laceration-hemorrhage - See Mallory-Weiss syndrome
* Gastrointestinal autonomic nerve tumor - See Plexosarcoma
* Gastrointestinal Stromal Sarcoma - See Gastrointestinal Stromal Tumors
* Gastrointestinal Stromal Tumors
* Gastroschisis
* Gaucher disease
* Gaucher disease collodion type - See Gaucher disease perinatal lethal
* Gaucher disease perinatal lethal
* Gaucher disease type 1
* Gaucher disease type 2
* Gaucher disease type 3
* Gaucher disease, acute neuronopathic type - See Gaucher disease type 2
* Gaucher disease, chronic neuronopathic type - See Gaucher disease type 3
* Gaucher disease, infantile cerebral - See Gaucher disease type 2
* Gaucher disease, juvenile and adult, cerebral - See Gaucher disease type 3
* Gaucher disease, noncerebral juvenile - See Gaucher disease type 1
* Gaucher disease, perinatal-lethal form - See Gaucher disease perinatal lethal
* Gaucher disease, subacute neuronopathic type - See Gaucher disease type 3
* Gaucher ichthyosis restrictive dermopathy
* Gaucher splenomegaly - See Gaucher disease
* Gaucher-like disease
* GAVE - See Watermelon stomach
* Gay Feinmesser Cohen syndrome
* Gaze palsy - See Supranuclear ocular palsy
* GBA DEFICIENCY - See Gaucher disease type 1
* GBBB syndrome - See Opitz G/BBB syndrome
* GBS - See Guillain-Barre syndrome
* GCA - See Giant cell arteritis
* GCBL - See Buschke Lowenstein tumor
* GCC of the cervix - See Glassy cell carcinoma of the cervix
* GCL - See Krabbe leukodystrophy
* GCL4 - See Congenital generalized lipodystrophy type 4
* GCM - See Giant cell myocarditis
* GCM syndrome - See Gorlin Chaudhry Moss syndrome
* GCPS - See Greig cephalopolysyndactyly syndrome
* GCS - See Gianotti Crosti syndrome
* GCS 1 - See Camptodactyly syndrome Guadalajara type 1
* GCSE - See Status epilepticus
* GCT of the ovary - See Granulosa cell tumor of the ovary
* GD 1 - See Gaucher disease type 1
* GD 2 - See Gaucher disease type 2
* GD 3 - See Gaucher disease type 3
* GDLD - See Amyloidosis corneal
* Gelatinous ascites
* Gelatinous drop-like corneal dystrophy - See Amyloidosis corneal
* Geleophysic dwarfism
* Geleophysic dysplasia - See Geleophysic dwarfism
* Gelineau syndrome - See Narcolepsy
* Gelineau's syndrome - See Narcolepsy
* Gemignani syndrome
* Gemistocytic astrocytoma (histologic variant) - See Diffuse astrocytoma
* GEMSS - See Glaucoma, Ectopia, Microspherophakia, Stiff joints and Short stature syndrome
* Genee-Wiedemann acrofacial dysostosis - See Miller syndrome
* Genee-Wiedemann syndrome - See Miller syndrome
* Generalized arterial calcification in infancy - See Arterial calcification of infancy
* Generalized congenital lipodystrophy with myopathy - See Congenital generalized lipodystrophy type 4
* Generalized convulsive status epilepticus - See Status epilepticus
* Generalized dominant dystrophic epidermolysis bullosa
* Generalized EBS - See Epidermolysis bullosa simplex, generalized
* Generalized elastolysis - See Cutis laxa
* Generalized enamel hypoplasia and renal dysfunction - See Amelogenesis imperfecta nephrocalcinosis
* Generalized erythroderma, diarrhea, and failure to thrive - See Erythroderma desquamativa of Leiner
* Generalized lichenoid papular eruption - See Scleromyxedema
* Generalized myotonia - See Myotonia congenita autosomal recessive
* Generalized papular and sclerodermoid - See Scleromyxedema
* Generalized PHA1 - See Autosomal recessive pseudohypoaldosteronism type 1
* Generalized pseudohypoaldosteronism type 1 - See Autosomal recessive pseudohypoaldosteronism type 1
* Generalized resistance to thyroid hormone
* Generalized torsion dystonia
* Generalized vulvar dysesthesia - See Dysesthetic Vulvodynia
*   Genetic breast cancer - See Familial breast cancer
* Genetic liability to schizophrenia in nonpsychotic individuals - See Schizotaxia
* Genetic reflex epilepsy
* Geniospasm
* Genital anomaly with cardiomyopathy - See Dilated cardiomyopathy with hypergonadotropic hypogonadism
* Genital dwarfism
* Genital dwarfism, Turner type
* Genital renal ear syndrome - See Mayer-Rokitansky-Kuster-Hauser syndrome
* Genital retraction syndrome - See Koro
* Genito palato cardiac syndrome
* Genitopalatocardiac syndrome - See Genito palato cardiac syndrome
* Genito-palato-cardiac syndrome - See Genito palato cardiac syndrome
* Genitopatellar syndrome
* Genoa syndrome
* Genochondromatosis
* Genu valgum, hereditary pubertal - See Genu valgum, st Helena familial
* Genu valgum, st Helena familial
* Geographic choroiditis - See Serpiginous choroiditis
* Geographic helicoid peripapillary choroidopathy (GHPC) - See Serpiginous choroiditis
* Geographic serpiginous choroiditis - See Serpiginous choroiditis
* Geographic tongue
* GEP tumors - See Gastro-enteropancreatic neuroendocrine tumor
* Gerhardt syndrome - See Vocal cord dysfunction familial
* German measles - See Rubella
* German syndrome
* German type amyloidosis - See Amyloidosis familial visceral
* Germinal cell aplasia - See Sertoli cell-only syndrome
* Germinoma
* Geroderma osteodysplastica
* Geroderma osteodysplasticum - See Geroderma osteodysplastica
* Gerodermia osteodysplastica - See Geroderma osteodysplastica
* Gershinibaruch Leibo syndrome
* Gershoni-Baruch syndrome
* Gerstmann Badal syndrome - See Gerstmann syndrome
* Gerstmann Straussler Scheinker syndrome - See Gerstmann-Straussler-Scheinker disease
* Gerstmann syndrome
* Gerstmann tetrad - See Gerstmann syndrome
* Gerstmann-Straussler-Scheinker disease
* Gestagenic diabetes insipidus - See Gestational diabetes insipidus
* Gestational diabetes insipidus
* Gestational gigantomastia (subtype) - See Gigantomastia
* Gestational pemphigoid - See Pemphigoid gestationis
* Gestational trophoblastic disease - See Gestational trophoblastic tumor
* Gestational trophoblastic neoplasm - See Gestational trophoblastic tumor
* Gestational trophoblastic tumor
* GFD - See Jones syndrome
* GFND1 - See Glomerulopathy with fibronectin deposits 1
* GFND2 - See Glomerulopathy with fibronectin deposits 2
* GGF1 - See Gingival fibromatosis, 1
* GGF2 - See Gingival fibromatosis, 2
* GGF3 - See Gingival fibromatosis, 3
* GGF4 - See Gingival fibromatosis, 4
* GGM - See Glucose-galactose malabsorption
* GGT deficiency - See Glutathionuria
* GGT1 deficiency - See Glutathionuria
* GHDD - See Ghosal hematodiaphyseal dysplasia syndrome
* Ghosal hematodiaphyseal dysplasia - See Ghosal hematodiaphyseal dysplasia syndrome
* Ghosal hematodiaphyseal dysplasia syndrome
* Ghosal syndrome - See Ghosal hematodiaphyseal dysplasia syndrome
* Ghose Sachdev Kumar syndrome
* Giaccai type acroosteolysis - See Hereditary sensory and autonomic neuropathy type 2
* Gianotti Crosti syndrome
* Giant axonal neuropathy
* Giant axonal neuropathy 1 - See Giant axonal neuropathy
* Giant cell arteritis
* Giant cell chondrodysplasia - See Atelosteogenesis type 1
* Giant cell fibroblastoma - See Dermatofibrosarcoma protuberans
* Giant cell glioblastoma (histologic variant) - See Glioblastoma
* Giant Cell Hepatitis (formerly) - See Neonatal hemochromatosis
* Giant cell inclusion disease - See Cytomegalic inclusion disease
* Giant cell myocarditis
* Giant condyloma acuminatum involving the prepuce and glans penis - See Buschke Lowenstein tumor
* Giant condyloma of Buschke and Löwenstein - See Buschke Lowenstein tumor
* Giant congenital nevus
* Giant eccrine acrospiroma (subtype) - See Acrospiroma
* Giant ganglionic hyperplasia
* Giant granulocellular Abrikosov's tumor - See Abrikosov's tumor
* Giant hairy nevus - See Giant congenital nevus
* Giant hamartoma of the breast - See Giant mammary hamartoma
* Giant hypertrophic gastritis - See Menetrier disease
* Giant hypertrophic gastropathy - See Menetrier disease
* Giant hypertrophy of the gastric mucosa - See Menetrier disease
* Giant mammary hamartoma
* Giant papillary conjunctivitis
* Giant pelvic retroperitoneal liposarcoma - See Retroperitoneal liposarcoma
* Giant pigmented hairy nevus - See Giant congenital nevus
* Giant pigmented nevus - See Giant congenital nevus
* Giant platelet disease - See Giant platelet syndrome
* Giant platelet syndrome
* Giant tongue - See Macroglossia
* Gibraltar fever - See Brucellosis
* Giedion syndrome - See Trichorhinophalangeal syndrome type 1
* Giedion-Langer syndrome - See Trichorhinophalangeal syndrome type 2
* Gigantism
* Gigantism advanced bone age hoarse cry
* Gigantism, partial, of hands and feet, nevi, hemihypertrophy, and macrocephaly - See Macrocephaly mesodermal hamartoma spectrum
* Gigantomastia
*   Gilbert syndrome
*   Gilbert's disease - See Gilbert syndrome
* Gilchrist's disease - See Blastomycosis
*   Gilles de la Tourette's syndrome - See Tourette syndrome
* Gillespie syndrome
* GINGF1 - See Gingival fibromatosis, 1
* GINGF2 - See Gingival fibromatosis, 2
* GINGF3 - See Gingival fibromatosis, 3
* GINGF4 - See Gingival fibromatosis, 4
* Gingival fibromatosis with progressive deafness - See Jones syndrome
* Gingival fibromatosis combined with cherubism - See Ramon Syndrome
* Gingival fibromatosis with craniofacial dysmorphism - See Gingival fibromatosis with distinctive facies
* Gingival fibromatosis with distinctive facies
* Gingival fibromatosis with hypertrichosis
* Gingival fibromatosis with sensorineural hearing loss - See Jones syndrome
* Gingival fibromatosis, 1
* Gingival fibromatosis, 2
* Gingival fibromatosis, 3
* Gingival fibromatosis, 4
* Gingival fibromatosis, abnormal fingers, fingernails, nose and ears, and splenomegaly - See Laband syndrome
* Gingival hypertrophy corneal dystrophy - See Rutherfurd syndrome
* Girate atrophy of the retina - See Gyrate atrophy of choroid and retina
* Giroux Barbeau Syndrome - See Spinocerebellar ataxia 34
* GIST - See Gastrointestinal Stromal Tumors
* Gitelman syndrome
* GJB2-related deafness - See DFNB1
* GK deficiency - See Hyperglycerolemia
* GK1 deficiency - See Hyperglycerolemia
* GKD - See Hyperglycerolemia
* GLA deficiency - See Fabry disease
* Glanders
* Glanzmann thrombasthenia
* Glanzmann thrombasthenia type A - See Glanzmann thrombasthenia
* Glass Chapman Hockley syndrome
* Glassy cell adenocarcinoma of the uterine cervix - See Glassy cell carcinoma of the cervix
* Glassy cell carcinoma of the cervix
* Glastre Cochat Bouvier syndrome - See Nephrotic syndrome ocular anomalies
* Glaucoma 1, open angle, A - See Primary open angle glaucoma juvenile onset 1
* Glaucoma 3 primary infantile B
* Glaucoma hereditary, juvenile - See Primary open angle glaucoma juvenile onset 1
* Glaucoma iridogoniodysgenesia
* Glaucoma primary congenita type 3B - See Glaucoma 3 primary infantile B
* Glaucoma sleep apnea
* Glaucoma type 1C
* Glaucoma, congenital
* Glaucoma, Ectopia, Microspherophakia, Stiff joints and Short stature syndrome
* Glaucoma, hereditary
* Glaucoma, hereditary adult type 1A
* Glaucoma, hereditary juvenile type 1B
* Glaucoma, primary infantile type 3A
*   Glaucomatocyclitic crisis - See Posner-Schlossman syndrome
* GLB 1 deficiency - See GM1 gangliosidosis
* GLB deficiency type 1 - See GM1 gangliosidosis type 1
* GLC1A - See Primary open angle glaucoma juvenile onset 1
* GLC3 type B - See Glaucoma 3 primary infantile B
* GLC3B - See Glaucoma 3 primary infantile B
* GLD - See Krabbe leukodystrophy
* Glioblastoma
* Glioblastoma multiforme - See Glioblastoma
* Glioma
* Glioma-polyposis syndrome - See Turcot syndrome
* Gliomatosis cerebri
* Gliomatosis peritonei
* Gliosarcoma
* Gliosarcoma (histologic variant) - See Glioblastoma
* Global disaccharide intolerance
* Globoid cell leukodystrophy - See Krabbe leukodystrophy
* Globoid cell leukoencephalopathy - See Krabbe leukodystrophy
* Glomerular basement membrane disease, nail-patella syndrome type - See Salcedo syndrome
* Glomerular nephritis familial with fibronectin deposits - See Glomerulopathy with fibronectin deposits 2
* Glomerulocystic kidney disease, hypoplastic type - See Maturity-onset diabetes of the young, type 5
* Glomerulocystic kidney, familial hypoplastic - See Maturity-onset diabetes of the young, type 5
* Glomerulonephritis
* Glomerulonephritis - mesangial proliferative - See Mesangial proliferative glomerulonephritis
* Glomerulonephritis - pulmonary hemorrhage - See Goodpasture syndrome
* Glomerulonephritis membranoproliferative type 2 - See Dense deposit disease
* Glomerulonephritis with sparse hair and telangiectases
* Glomerulonephritis, IGA - See Berger disease
* Glomerulonephritis, membranous - See Membranous nephropathy
* Glomerulopathy with fibronectin deposits 1
* Glomerulopathy with fibronectin deposits 2
* Glomerulopathy with giant fibrillar deposits - See Glomerulopathy with fibronectin deposits 1
* Glomerulosclerosis, focal - See Focal segmental glomerulosclerosis
* Glomus jugulare tumors
* Glomus tumor - See Glomus jugulare tumors
* Glomus tumors familial 1 - See Paragangliomas 1
* Glomus tumors, familial, 2 - See Paragangliomas 2
* Glomus tumors, familial, 3 - See Paragangliomas 3
* Glomus tympanicum paraganglioma - See Glomus tympanicum tumor
* Glomus tympanicum tumor
* Glomus vagale tumors
* Gloomy face syndrome - See 3M syndrome
* Glossodynia
* Glossopalatine ankylosis cataracts digital anomalies - See Johnson Hall Krous syndrome
* Glossopalatine ankylosis micrognathia ear anomalies
* Glossopharyngeal neuralgia
* Glossoptosis, micrognathia, and cleft palate - See Pierre Robin sequence
* Glucagonoma
* Glucagonoma syndrome
* Glucocerebrosidase deficiency - See Gaucher disease type 1
* Glucocerebrosidosis - See Gaucher disease
* Glucocorticoid resistance
* Glucocorticoid sensitive hypertension - See Glucocorticoid-remediable aldosteronism
* Glucocorticoid-remediable aldosteronism
* Glucose galactose malabsorption deficiency - See Glucose-galactose malabsorption
* Glucose transport defect, blood-brain barrier - See Glucose transporter type 1 deficiency syndrome
* Glucose transporter protein syndrome - See Glucose transporter type 1 deficiency syndrome
* Glucose transporter type 1 deficiency syndrome
* Glucose-6-phosphatase deficiency - See Glycogen storage disease type 1A
* Glucose-6-phosphatase deficiency glycogen storage disease - See Glycogen storage disease type 1A
* Glucose-6-phosphate dehydrogenase deficiency
* Glucose-6-phosphate translocase deficiency
* Glucose-6-phosphate transport defect - See Glycogen storage disease type 1B
* Glucose-galactose malabsorption
* Glucosephosphate isomerase deficiency
* Glucosidase acid-1,4-alpha deficiency
* Glucosyl cerebroside lipidosis - See Gaucher disease
* Glucosylceramidase deficiency - See Gaucher disease
* GLUT1 deficiency syndrome - See Glucose transporter type 1 deficiency syndrome
* GLUT-1 deficiency syndrome - See Glucose transporter type 1 deficiency syndrome
* GLUT1 DS - See Glucose transporter type 1 deficiency syndrome
* GLUT2 deficiency - See Fanconi Bickel syndrome
* Glutamate decarboxylase deficiency
* Glutamate formiminotransferase deficiency
* Glutamate-aspartate transport defect - See Dicarboxylic aminoaciduria
* Glutamine deficiency, congenital
* Glutamine synthetase deficiency, congenital systemic - See Glutamine deficiency, congenital
* Glutaric acidemia 1 - See Glutaric acidemia type I
* Glutaric acidemia 2 - See Glutaric acidemia type II
* Glutaric acidemia type 1 - See Glutaric acidemia type I
* Glutaric acidemia type 2 - See Glutaric acidemia type II
* Glutaric acidemia type I
* Glutaric acidemia type II
* Glutaric aciduria 1 - See Glutaric acidemia type I
* Glutaric aciduria 2 - See Glutaric acidemia type II
* Glutaryl-CoA dehydrogenase deficiency - See Glutaric acidemia type I
* Glutathione synthetase deficiency
* Glutathionuria
* Gluteal muscle, absence of - See Absence of gluteal muscle
*   Gluten intolerance - See Celiac disease
*   Gluten-induced enteropathy - See Celiac disease
*   Gluten-sensitive enteropathy - See Celiac disease
* Glyceraldehyde-3-phosphate dehydrogenase deficiency
* Glyceric aciduria - See Primary hyperoxaluria type 2
* Glycerol kinase deficiency - See Hyperglycerolemia
* Glycine encephalopathy
* Glycine N-methyltransferase deficiency
* Glycine synthase deficiency - See Glycine encephalopathy
* Glycinemia, ketotic - See Propionic acidemia
* Glycogen branching enzyme deficiency - See Glycogen storage disease type 4
* Glycogen debrancher deficiency - See Glycogen storage disease type 3
* Glycogen storage cardiomyopathy - See Danon disease
* Glycogen storage disease 12 - See Glycogen storage disease type 12
* Glycogen storage disease 13 - See Glycogen storage disease type 13
* Glycogen storage disease 1A - See Glycogen storage disease type 1A
* Glycogen storage disease 6 - See Glycogen storage disease type 6
* Glycogen storage disease 8
* Glycogen storage disease limited to the heart - See Danon disease
* Glycogen storage disease type 0
* Glycogen storage disease type 0, liver - See Glycogen storage disease type 0
* Glycogen storage disease type 0, muscle
* Glycogen storage disease type 12
* Glycogen storage disease type 13
* Glycogen storage disease type 14
* Glycogen storage disease type 1A
* Glycogen storage disease type 1B
* Glycogen storage disease type 2
* Glycogen storage disease type 2b (formerly) - See Danon disease
* Glycogen storage disease type 3
* Glycogen storage disease type 4
* Glycogen storage disease type 5
* Glycogen storage disease type 6
* Glycogen storage disease type 7
* Glycogen storage disease type IV - See Glycogen storage disease type 4
* Glycogen storage disease VIII - See Glycogen storage disease 8
* Glycogen storage disease X - See Phosphoglycerate mutase deficiency
* Glycogen storage disease XI - See Fanconi Bickel syndrome
* Glycogen Storage Disease XI - See Lactate dehydrogenase A deficiency
* Glycogen synthetase deficiency - See Glycogen storage disease type 0
* Glycogenosis 4 - See Glycogen storage disease type 4
* Glycogenosis Fanconi type - See Fanconi Bickel syndrome
* Glycogenosis type 1 - See Glycogen storage disease type 1A
* Glycogenosis type 8 - See Glycogen storage disease 8
* Glycogenosis, type 0 - See Glycogen storage disease type 0
* Glycogen-rich adenocarcinoma - See Epithelial-myoepithelial carcinoma
* Glycogen-rich adenoma - See Epithelial-myoepithelial carcinoma
* Glycolic aciduria - See Primary hyperoxaluria type 1
* Glycoprotein neuraminidase deficiency - See Sialidosis, type II
* Glycoprotein neuraminidase deficiency - See Sialidosis, type II
* Glycoproteinosis
* Glycosylasparaginase deficiency - See Aspartylglycosaminuria
* Glycosylphosphatidylinositol deficiency
* Glyoxylate reductase/hydroxypyruvate reductase deficiency - See Primary hyperoxaluria type 2
* GM1 gangliosidosis
* GM1 gangliosidosis type 1
* GM1 gangliosidosis type 2
* GM1 gangliosidosis type 3
* GM2 gangliosidosis, 0 variant
* GM2 gangliosidosis, type 1 - See Tay-Sachs disease
* GM2 gangliosidosis, type 2 - See Sandhoff disease
* GM2-gangliosidosis, B, B1, AB variant
* GM3 synthase deficiency - See Amish infantile epilepsy syndrome
* Gms syndrome
* Gnathostoma Infection
* Gnathostomiasis - See Gnathostoma Infection
* GNE myopathy - See Inclusion body myopathy 2
* GNMT deficiency - See Glycine N-methyltransferase deficiency
* GNPTA - See I cell disease
* GO - See Geroderma osteodysplastica
* Goblet cell carcinoid
* Goblet cell carcinoma - See Goblet cell carcinoid
* Goeminne syndrome - See Torticollis keloids cryptorchidism renal dysplasia
* Goiter-deafness syndrome - See Pendred syndrome
* Golabi-Rosen syndrome - See Simpson-Golabi-Behmel syndrome
* Goldberg syndrome - See Galactosialidosis
* Goldberg-Shprintzen megacolon syndrome
* Goldberg-Shprintzen syndrome - See Goldberg-Shprintzen megacolon syndrome
* Goldblatt chondrodysplasia - See Spondylometaphyseal dysplasia with dentinogenesis imperfecta
* Goldblatt syndrome - See Spondylometaphyseal dysplasia with dentinogenesis imperfecta
* Goldblatt Wallis syndrome - See Hypospadias mental retardation Goldblatt type
* Goldblatt-Viljoen syndrome - See Radial ray hypoplasia choanal atresia
* Goldenhar disease
* Goldenhar syndrome - See Goldenhar disease
* Goldenhar syndrome with ipsilateral radial defect - See Microsomia hemifacial radial defects
* Goldmann-Favre syndrome
* Goldstein Hutt syndrome - See Trichomegaly, cataract, and hereditary spherocytosis
* Gollop Coates syndrome
* Gollop-Wolfgang complex - See Femur bifid with monodactylous ectrodactyly
* Goltz Gorlin Syndrome - See Focal dermal hypoplasia
* Goltz Syndrome - See Focal dermal hypoplasia
* GOMBO syndrome
* Gomez Lopez Hernandez syndrome
* Gomm Button disease - See Acute febrile neutrophilic dermatosis
* Gonadal dysgenesis
* Gonadal Dysgenesis (45,X) - See Turner syndrome
* Gonadal dysgenesis mixed
* Gonadal dysgenesis Turner type
* Gonadal dysgenesis XX type deafness - See Gonadal dysgenesis, XX type
* Gonadal dysgenesis XY type associated anomalies
* Gonadal dysgenesis, XX type
* Gonadal dysgenesis, XY female type - See Swyer syndrome
* Gonadotropin deficiency familial idiopathic - See Eunuchoidism familial hypogonadotropic
* Goniodysgenesis hypodontia - See Axenfeld-Rieger syndrome
* Goniodysgenesis mental retardation short stature
* Gonococcal conjunctivitis
* Gonococcal perihepatitis - See Fitz-Hugh-Curtis syndrome
* Gonzales-del Angel syndrome - See Delayed membranous cranial ossification
* Good syndrome
* Goodman camptodactyly - See Goodman syndrome
* Goodman syndrome
* Goodpasture syndrome
* Gordon hyperkalemia-hypertension syndrome - See Pseudohypoaldosteronism type 2
* Gordon syndrome
* Gorham's disease
* Gorham-Stout disease - See Gorham's disease
* Gorham-Stout syndrome - See Gorham's disease
* Gorlin Bushkell Jensen syndrome
* Gorlin Chaudhry Moss syndrome
* Gorlin Syndrome - See Nevoid basal cell carcinoma syndrome
* Gorlin-Chaudhry-Moss syndrome - See Gorlin Chaudhry Moss syndrome
* Gorlin-Goltz Syndrome - See Nevoid basal cell carcinoma syndrome
* GOSHS - See Goldberg-Shprintzen megacolon syndrome
* Gottron syndrome - See Acrogeria, Gottron type
* Gouty nephropathy, familial
* Gouty nephropathy, familial juvenile - See Familial juvenile hyperuricaemic nephropathy
* GPAPP deficiency - See Chondrodysplasia with joint dislocations, GPAPP type
* GPC - See Giant papillary conjunctivitis
* GPHN - See Giant congenital nevus
* GPI deficiency - See Glycosylphosphatidylinositol deficiency
* GPS - See Gray platelet syndrome
* Gracile bone dysplasia
* GRACILE syndrome
* Graefe-Usher syndrome - See Usher syndrome
* Graham Boyle Troxell syndrome
* Grand Kaine Fulling syndrome
* Grant syndrome
* Granular and lattice corneal dystrophies - See Corneal dystrophy Avellino type
* Granular corneal dystrophy type 2 - See Corneal dystrophy Avellino type
* Granular-lattice (Avellino) corneal dystrophy - See Corneal dystrophy Avellino type
* Granulocytic sarcoma (cell type) - See Myeloid sarcoma
* Granulocytopenia
* Granuloma annulare
* Granuloma fungoides - See Mycosis fungoides
* Granuloma Inguinale
* Granulomas, congenital cerebral
* Granulomatosis with polyangiitis (Wegener's)
* Granulomatosis, familial juvenile systemic - See Blau syndrome
* Granulomatosis, familial, Blau type - See Blau syndrome
* Granulomatous allergic angiitis - See Churg Strauss syndrome
* Granulomatous angiitis of the central nervous system - See Primary angiitis of the central nervous system
*   Granulomatous colitis - See Crohn's disease
* Granulomatous disease, chronic - See Chronic granulomatous disease
*   Granulomatous enteritis - See Crohn's disease
* Granulomatous hypophysitis
* Granulomatous inflammatory arthritis, dermatitis, and uveitis, familial - See Blau syndrome
* Granulomatous rosacea
* Granulomatous slack skin - See Granulomatous slack skin disease
* Granulomatous slack skin disease
* Granulosa cell tumor - See Abrikosov's tumor
* Granulosa cell tumor of the ovary
* Granulosa theca cell tumor - See Granulosa cell tumor of the ovary
* Granulosa theca cell tumor of the ovary - See Granulosa cell tumor of the ovary
* Graphite Pneumoconiosis
* Gräsbeck-Imerslund disease - See Imerslund-Grasbeck syndrome
* Graves' disease
* Graves' hyperthyroidism - See Graves' disease
* Gray platelet syndrome
* Gray zone lymphoma
* Grebe chondrodysplasia - See Chondrodysplasia, Grebe type
* Grebe dysplasia - See Chondrodysplasia, Grebe type
* Grebe syndrome - See Chondrodysplasia, Grebe type
* Green Sandford Davison syndrome
* Greenberg dysplasia - See Hydrops, Ectopic calcification, Moth-eaten skeletal dysplasia
* Greenberg skeletal dysplasia - See Hydrops, Ectopic calcification, Moth-eaten skeletal dysplasia
* Greig cephalopolysyndactyly syndrome
* Greig syndrome - See Greig cephalopolysyndactyly syndrome
* Greither disease - See Keratoderma palmoplantaris transgrediens
* Greither's disease - See Keratoderma palmoplantaris transgrediens
* GRES syndrome - See Mayer-Rokitansky-Kuster-Hauser syndrome
* Griscelli disease - See Griscelli syndrome
* Griscelli syndrome
* Griscelli syndrome type 1
* Griscelli syndrome type 2
* Griscelli syndrome type 3
* Griscelli syndrome with hemophagocytic syndrome - See Griscelli syndrome type 2
* Griscelli syndrome with neurologic impairment - See Griscelli syndrome type 1
* Griscelli syndrome, cutaneous and neurologic type - See Griscelli syndrome type 1
* Grix Blankenship Peterson syndrome
* Groenouw type I corneal dystrophy
* Groenouw type II corneal dystrophy - See Macular dystrophy, corneal type 1
* Groll Hirschowitz syndrome
* Gronblad Strandberg syndrome - See Pseudoxanthoma elasticum
* Grosse syndrome - See Cranioacrofacial syndrome
* Ground itch - See Cutaneous larva migrans
* Group A Streptococcal disease - See Streptococcal Group A invasive disease
* Group A Streptococcal infection - See Streptococcal Group A invasive disease
* Group B strep disease in newborns
* Grover disease - See Transient acantholytic dermatosis
* Grover's disease - See Transient acantholytic dermatosis
* Growth and mental retardation, mandibulofacial dysostosis, microcephaly, and cleft palate
* Growth deficiency brachydactyly unusual facies
* Growth deficiency, facial anomalies, and brachydactyly - See Frias syndrome
* Growth deficiency, sun-sensitive, telangiectatic, hypo and hyperpigmented skin, predisposition to malignancy and chromosomal instability - See Bloom syndrome
* Growth hormone deficiency
* Growth hormone deficiency with hypogammaglobulinemia - See Isolated growth hormone deficiency type 3
* Growth hormone deficiency, isolated autosomal dominant - See Isolated growth hormone deficiency type 2
* Growth hormone deficiency, isolated autosomal recessive - See Isolated growth hormone deficiency type 1A
* Growth hormone excess - See Acromegaly
* Growth hormone insensitivity due to postreceptor defect - See Growth hormone insensitivity with immunodeficiency
* Growth hormone insensitivity syndrome - See Laron syndrome
* Growth hormone insensitivity with immunodeficiency
* Growth hormone receptor deficiency - See Laron syndrome
* Growth mental deficiency syndrome of Myhre - See Myhre syndrome
* Growth retardation alopecia pseudoanodontia optic
* Growth retardation hydrocephaly lung hypoplasia
* Growth retardation mental retardation phalangeal hypoplasia
* Growth retardation prenatal with progressive pancytopenia and cerebellar hypoplasia - See Hoyeraal Hreidarsson syndrome
* Growth retardation with sensorineural deafness and mental retardation - See Insulin-like growth factor I deficiency
* Growth retardation, Alopecia, Pseudoanodontia and Optic atrophy - See GAPO syndrome
* Growth Retardation, Aminoaciduria, Cholestasis, Iron overload, Lactic acidosis and Early death - See GRACILE syndrome
* Growth retardation, deafness, femoral epiphyseal dysplasia, and lacrimal duct obstruction - See Deafness, epiphyseal dysplasia, short stature
* Growth retardation, ocular abnormalities, microcephaly, brachydactyly, and oligophrenia - See GOMBO syndrome
* Growth retardation, pulmonary hypertension, and aminoaciduria - See Rowley-Rosenberg syndrome
* Growth retardation, severe mental retardation, acral limb deficiencies with poorly keratinized nails - See Cartwright Nelson Fryns syndrome
* Growth retardation, small and puffy hands and feet, and eczema - See Grubben de Cock Borghgraef syndrome
* Growth retardation, truncal obesity, facial asymmetry, hypotonia, small phallus, malformed low-set ears and micrognathia - See Diploid-triploid mosaicism
* GRTH - See Generalized resistance to thyroid hormone
* Grubben de Cock Borghgraef syndrome
* Gruber syndrome - See Meckel syndrome
* GS - See Gerstmann syndrome
* GS1 - See Griscelli syndrome type 1
* GS2 - See Griscelli syndrome type 2
* GS3 - See Griscelli syndrome type 3
* GSD 4 - See Glycogen storage disease type 4
* GSD 5 - See Glycogen storage disease type 5
* GSD II - See Glycogen storage disease type 2
* GSD IV - See Glycogen storage disease type 4
* GSD type 14 - See Glycogen storage disease type 14
* GSD1 - See Glycogen storage disease type 1A
* GSD10 - See Phosphoglycerate mutase deficiency
* GSD12 - See Glycogen storage disease type 12
* GSD13 - See Glycogen storage disease type 13
* GSD1B - See Glycogen storage disease type 1B
* GSD2B (formerly) - See Danon disease
* GSD6 - See Glycogen storage disease type 6
* GSD7 - See Glycogen storage disease type 7
* GSDX - See Phosphoglycerate mutase deficiency
* GSDXIV - See Glycogen storage disease type 14
* GSL - See Galactosialidosis
* GSM 1 - See Geniospasm
* GSSD - See Gerstmann-Straussler-Scheinker disease
* GT - See Glanzmann thrombasthenia
* GTCT - See Granulosa cell tumor of the ovary
* GTG deficiency - See Glutathionuria
* GTP Cyclohydrolase 1-Deficient Dopa-Responsive Dystonia - See Dystonia 5, Dopa-responsive type
* GTP cyclohydrolase I deficiency
* GTPTS - See Genitopatellar syndrome
* Guadalajara camptodactyly syndrome type II - See Camptodactyly syndrome Guadalajara type 2
* Guam disease - See Amyotrophic lateral sclerosis-parkinsonism/dementia complex 1
* Guanidinoacetate methyltransferase deficiency
* Guerin-Stern syndrome - See Arthrogryposis multiplex congenita
* Guérin-Stern syndrome - See Arthrogryposis multiplex congenita
* Guibaud Vainsel syndrome - See Osteopetrosis autosomal recessive 3
* Guillain-Barre syndrome
* Guinea worm disease - See Dracunculiasis
* Guinea worm infection - See Dracunculiasis
* Guizar Vasquez Sanchez Manzano syndrome
* Gunal Seber Basaran syndrome - See Osteopoikilosis and dacryocystitis
* Günther disease - See Congenital porphyria
* Gupta Patton syndrome
* Gurrieri syndrome
* Gurrieri-Sammito-Bellussi syndrome - See Gurrieri syndrome
* GUSB deficiency - See Mucopolysaccharidosis type VII
* Gusher syndrome - See Deafness, X-linked 2
* GUST - See X-linked mental retardation Gustavson type
* Gustatory sweating - See Frey's syndrome
* Gustavson syndrome - See X-linked mental retardation Gustavson type
* Guttate psoriasis
* Guttmacher syndrome - See Preaxial deficiency, postaxial polydactyly and hypospadias
* GWAFD - See Miller syndrome
* GWC - See Femur bifid with monodactylous ectrodactyly
* GWD - See Dracunculiasis
* Gynandroblastoma
* Gyrate atrophy - See Gyrate atrophy of choroid and retina
* Gyrate atrophy of choroid and retina