This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.
|Medical Terms||Other Names||
|80%-99% of people have these symptoms|
|First degree atrioventricular block||0011705|
Early and severe mental retardation
Mental retardation, severe
Severe mental retardation[ more ]
Lack of facial expression
Mask-like facial appearance[ more ]
|Skeletal muscle atrophy||
Muscle wasting[ more ]
|30%-79% of people have these symptoms|
|Abnormal hair quantity||0011362|
|Abnormality of cardiovascular system morphology||0030680|
|Abnormality of the endocrine system||0000818|
|Intellectual disability, progressive||
Mental retardation, progressive
Progressive mental retardation[ more ]
Difficulty breathing[ more ]
|5%-29% of people have these symptoms|
|Abnormality of the upper urinary tract||0010935|
Undescended testis[ more ]
|Hernia of the abdominal wall||0004299|
Dislocation of hip[ more ]
Squint eyes[ more ]
|1%-4% of people have these symptoms|
|Percent of people who have these symptoms is not available through HPO|
Degeneration of cerebrum
|Decreased fetal movement||0001558|
Swallowing difficulty[ more ]
|Excessive daytime sleepiness||0002189|
|Feeding difficulties in infancy||0008872|
Decreased muscle tone
Low muscle tone[ more ]
Decreased activity of gonads
The resources below provide information about treatment options for this condition. If you have questions about which treatment is right for you, talk to your healthcare professional.
Research helps us better understand diseases and can lead to advances in diagnosis and treatment. This section provides resources to help you learn about medical research and ways to get involved.
Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.
Living with a genetic or rare disease can impact the daily lives of patients and families. These resources can help families navigate various aspects of living with a rare disease.
These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.
Got a Great Research Idea? ‘All of Us’ Wants to Hear It!
January 18, 2018
New NCATS Rare Diseases Research Video
December 27, 2017
Rare Disease Day at NIH on March 1, 2018
December 19, 2017
Questions sent to GARD may be posted here if the information could be helpful to others. We remove all identifying information when posting a question to protect your privacy. If you do not want your question posted, please let us know. Submit a new question
My son is a young adult and has myotonic dystrophy type 1. He has early cataracts and many other symptoms. He wears glasses and appears recently to have a wandering eye. He also has double vision and fatigue. Is this caused by the myotonic dystrophy? What treatment is recommended? See answer
My girlfriend's grandmother has Myotonic dystrophy type 1. Fortunately neither my girlfriend's mother nor father is affected, but this disease is quite common in her mother's family. I want to know the probability that either my girlfriend or our children could get this disease. See answer