Overview
Juvenile idiopathic inflammatory myopathy (JIIM) is a group of rare autoimmune diseases that primarily affect children and teenagers, causing inflammation in the muscles and sometimes the skin. The most common forms include juvenile dermatomyositis and juvenile polymyositis. In these conditions, the body's immune system mistakenly attacks its own healthy muscle tissue, leading to muscle weakness, pain, and fatigue. When the skin is involved, children may develop distinctive rashes, particularly a purplish discoloration around the eyes or over the knuckles. The disease typically causes weakness in the muscles closest to the trunk of the body, such as the thighs, upper arms, neck, and trunk. Children may have trouble climbing stairs, getting up from the floor, lifting their arms, or holding their head up. Some children also develop calcium deposits under the skin (calcinosis), difficulty swallowing, or lung problems. In rare cases, blood vessels throughout the body can become inflamed. Treatment focuses on suppressing the overactive immune system and reducing inflammation. First-line therapy usually involves high-dose corticosteroids such as prednisone, often combined with other immunosuppressive medications like methotrexate. Intravenous immunoglobulin (IVIG) is also commonly used. Physical therapy plays a critical role in maintaining muscle strength and function. With early and aggressive treatment, many children achieve remission or significant improvement, though some may have a chronic relapsing course.
Also known as:
Key symptoms:
Muscle weakness, especially in the thighs and upper armsDifficulty climbing stairs or getting up from the floorPurplish or reddish rash around the eyes (heliotrope rash)Red or scaly bumps over the knuckles (Gottron papules)Fatigue and low energyMuscle pain or tendernessDifficulty swallowingDifficulty raising arms above the headCalcium deposits under the skin (hard lumps)FeverJoint pain or swellingSkin ulcersHoarse or nasal-sounding voiceShortness of breathBelly pain
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 idiopathic inflammatory myopathy.
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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 idiopathic inflammatory myopathy.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
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 type of juvenile inflammatory myopathy does my child have, and how severe is it?,What medications will be used, and what are the possible side effects we should watch for?,How often will my child need blood tests and follow-up visits?,What physical activities are safe, and should we start physical therapy right away?,What are the signs of a disease flare, and when should we seek urgent care?,Are there any clinical trials or newer treatments available for my child?,What is the long-term outlook, and what complications should we be aware of?
Common questions about Juvenile idiopathic inflammatory myopathy
What is Juvenile idiopathic inflammatory myopathy?
Juvenile idiopathic inflammatory myopathy (JIIM) is a group of rare autoimmune diseases that primarily affect children and teenagers, causing inflammation in the muscles and sometimes the skin. The most common forms include juvenile dermatomyositis and juvenile polymyositis. In these conditions, the body's immune system mistakenly attacks its own healthy muscle tissue, leading to muscle weakness, pain, and fatigue. When the skin is involved, children may develop distinctive rashes, particularly a purplish discoloration around the eyes or over the knuckles. The disease typically causes weaknes
How is Juvenile idiopathic inflammatory myopathy inherited?
Juvenile idiopathic inflammatory myopathy follows a multifactorial inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Juvenile idiopathic inflammatory myopathy typically begin?
Typical onset of Juvenile idiopathic inflammatory myopathy is juvenile. Age of onset can vary across affected individuals.
Which specialists treat Juvenile idiopathic inflammatory myopathy?
15 specialists and care centers treating Juvenile idiopathic inflammatory myopathy are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.