Myositis Care in Collegeville, PA
Myositis is autoimmune inflammation of the muscles that causes weakness. Early treatment helps preserve strength.
What is myositis?
Myositis refers to a group of autoimmune diseases in which the immune system inflames the muscles. The main types include dermatomyositis, which also involves the skin, polymyositis, and immune-mediated necrotizing myopathy. The hallmark is muscle weakness, not just soreness or tiredness.
Common symptoms
- Gradual weakness in the shoulders, hips, and thighs
- Trouble climbing stairs, rising from a chair, or lifting your arms overhead
- A purplish rash on the eyelids or a rash over the knuckles (dermatomyositis)
- Difficulty swallowing
- Shortness of breath or a dry cough from lung involvement
- Muscle pain or fatigue in some people
How myositis is diagnosed
Diagnosis combines a strength examination with blood tests, including muscle enzymes such as CK and myositis-specific antibodies. Additional tests may include EMG, MRI of the muscles, and sometimes a muscle biopsy. Because myositis can affect the lungs, we also look for lung involvement.
Treatment
Treatment usually combines corticosteroids with other immune-modulating medications to calm the inflammation and restore strength, along with physical therapy to rebuild muscle. People with dermatomyositis also need careful sun protection. Regular monitoring checks muscle strength, blood tests, and the lungs.
Medically reviewed by Dr. Shady Abdelbaki, MD · Last reviewed October 25, 2026
Frequently asked questions about myositis
Is muscle weakness the same as fatigue?
No. Fatigue is a feeling of tiredness, while weakness means your muscles cannot generate normal force, such as when climbing stairs or lifting your arms. Myositis causes true weakness.
Can medications cause muscle symptoms too?
Yes. Some medications, including statins, can cause muscle symptoms, which is one reason careful evaluation matters before a diagnosis is made.
Does myositis affect other organs?
It can. The lungs, esophagus, and heart can be involved, so monitoring includes more than the muscles.
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