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|
|30%-79% of people have these symptoms|
|Elevated serum creatine kinase||
Increased serum creatine kinase
Increased serum CK
Increased creatine phosphokinase
Increased serum creatine phosphokinase
Increased creatine kinase
High serum creatine kinase
Elevated serum creatine phosphokinase
Elevated serum CPK
Elevated creatine kinase
Elevated circulating creatine phosphokinase
Elevated blood creatine phosphokinase[ more ]
|Feeding difficulties in infancy||0008872|
Flexed joint that cannot be straightened
Impaired gait[ more ]
Muscle pain[ more ]
|5%-29% of people have these symptoms|
Elevated serum potassium levels
Stiff joints[ more ]
Weakness of muscles controlling eye movement
|Skeletal muscle hypertrophy||
Increased skeletal muscle cells
|Percent of people who have these symptoms is not available through HPO|
|Apneic episodes in infancy||0005949|
Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.
If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.
If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.
You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.
Related diseases are conditions that have similar signs and symptoms. A health care provider may consider these conditions in the table below when making a diagnosis. Please note that the table may not include all the possible conditions related to this disease.
Conditions with similar signs and symptoms from Orphanet
Differential diagnoses include myotonia congenita (see this term), and cold sensitive myotonias such as paramyotonia congenita and hyperkalemic periodic paralysis with paramyotonia (see these terms).
Visit the Orphanet disease page for more information.
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.
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How many people in the world have potassium aggravated myotonia? See answer