Overview
Juvenile overlap myositis is a rare autoimmune muscle disease that begins in childhood or adolescence. It belongs to a group of conditions called juvenile idiopathic inflammatory myopathies (JIIM). The word 'overlap' means that this condition shares features with other autoimmune diseases, such as scleroderma, lupus, or mixed connective tissue disease, in addition to the core muscle inflammation (myositis). Children with this condition typically experience muscle weakness, especially in the muscles closest to the trunk of the body, such as the thighs and upper arms. They may also develop skin rashes, joint pain and swelling, difficulty swallowing, and problems with the lungs or other organs depending on which overlap features are present. The exact cause is not fully understood, but it involves the immune system mistakenly attacking the body's own muscles and other tissues. Certain autoantibodies (immune proteins) are often found in the blood and can help doctors identify the specific type of myositis. Treatment usually involves medications that suppress the overactive immune system, such as corticosteroids (like prednisone) and other immunosuppressive drugs including methotrexate or mycophenolate mofetil. Physical therapy is also an important part of care to maintain muscle strength and function. With early and appropriate treatment, many children can achieve significant improvement, though the disease may follow a relapsing course requiring long-term management.
Key symptoms:
Muscle weakness, especially in the upper arms and thighsMuscle pain or tendernessSkin rashes, including redness on the face, knuckles, or chestJoint pain and swellingFatigue and low energyDifficulty swallowingShortness of breath or breathing problemsRaynaud's phenomenon (fingers turning white or blue in the cold)Hardening or tightening of the skinFeverWeight lossDifficulty climbing stairs or getting up from a chairCalcinosis (calcium deposits under the skin)Voice changes or hoarseness
Multifactorial
Caused by a mix of several genes and environmental factors
Juvenile
Begins in the teen years
Treatments
No FDA-approved treatments are currently listed for Juvenile overlap myositis.
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Specialists
View all specialists →No specialists are currently listed for Juvenile overlap myositis.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Juvenile overlap myositis.
Community
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Caregiver Resources
NORD Caregiver Resources
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Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What specific type of myositis does my child have, and what autoantibodies were found?,Which organs are affected besides the muscles, and how will you monitor them?,What medications will my child need, how long will treatment last, and what are the possible side effects?,How often will my child need blood tests and follow-up visits?,What physical activities are safe, and should my child participate in physical education at school?,What signs of a disease flare should I watch for, and when should I call you urgently?,Are there any clinical trials or new treatments available for juvenile overlap myositis?
Common questions about Juvenile overlap myositis
What is Juvenile overlap myositis?
Juvenile overlap myositis is a rare autoimmune muscle disease that begins in childhood or adolescence. It belongs to a group of conditions called juvenile idiopathic inflammatory myopathies (JIIM). The word 'overlap' means that this condition shares features with other autoimmune diseases, such as scleroderma, lupus, or mixed connective tissue disease, in addition to the core muscle inflammation (myositis). Children with this condition typically experience muscle weakness, especially in the muscles closest to the trunk of the body, such as the thighs and upper arms. They may also develop skin
How is Juvenile overlap myositis inherited?
Juvenile overlap myositis follows a multifactorial inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Juvenile overlap myositis typically begin?
Typical onset of Juvenile overlap myositis is juvenile. Age of onset can vary across affected individuals.