Myositis / Inflammatory Muscle Diseases
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What is Myositis?
Myositis refers to a group of inflammatory muscle diseases that cause muscle weakness, pain, and fatigue. These conditions are caused by an overactive immune system attacking healthy muscle tissue, leading to chronic inflammation, muscle damage, and weakness.
If left untreated, myositis can significantly impact mobility, daily activities, and overall quality of life. Some forms of myositis also involve the skin, lungs, and other organs.
Types of Myositis (Inflammatory Myopathies)
Dermatomyositis (DM) – Myositis with Skin Involvement
Dermatomyositis is a type of autoimmune myositis that affects both muscles and skin.
✔ Muscle Weakness – Often affects the shoulders, neck, hips, and thighs, making it difficult to climb stairs, lift objects, or get up from a chair.
✔ Skin Rashes – A red or purple rash on the face, eyelids, knuckles, elbows, knees, or back.
✔ Gottron’s Papules – Raised, scaly bumps on the knuckles.
✔ Heliotrope Rash – A purple discoloration of the eyelids.
✔ Lung Involvement – Some patients develop interstitial lung disease (ILD), which causes breathing difficulties and lung scarring.
If you have muscle weakness and skin rashes, you may have dermatomyositis. Early diagnosis is key—consult a rheumatologist today!
Polymyositis (PM) – Widespread Muscle Inflammation
Polymyositis is a form of autoimmune myositis that primarily affects the muscles, leading to progressive weakness and inflammation.
✔ Symmetric Muscle Weakness – Typically involves the hips, thighs, shoulders, neck, and upper arms.
✔ Difficulty with Everyday Movements – Standing up, walking upstairs, and lifting objects become increasingly difficult.
✔ Swallowing Issues (Dysphagia) – In some cases, muscles in the throat are affected, making swallowing difficult.
✔ Associated with Other Autoimmune Diseases – PM can occur alongside lupus, rheumatoid arthritis, and scleroderma.
If you are experiencing persistent muscle weakness, a specialist evaluation is critical. Get expert help at Rheumatologist OnCall.
Necrotizing Autoimmune Myositis (NAM) – Rapidly Progressive Muscle Damage
Necrotizing autoimmune myositis (NAM) is a severe and aggressive form of myositis characterized by widespread muscle cell death (necrosis) rather than inflammation.
✔ Severe Muscle Weakness – Rapid loss of muscle strength and difficulty walking or lifting objects.
✔ High Levels of CK (Creatine Kinase) – A blood test shows severe muscle damage.
✔ Minimal Inflammation on Biopsy – Unlike polymyositis and dermatomyositis, muscle biopsies in NAM often show necrosis without significant immune cell infiltration.
✔ Strongly Linked to Certain Autoantibodies – Includes HMGCR antibodies (associated with statin-induced myositis) and SRP antibodies.
Necrotizing myositis requires early and aggressive treatment to prevent permanent muscle loss.
Inclusion Body Myositis (IBM) – Muscle Wasting in Older Adults
Inclusion Body Myositis (IBM) is a slowly progressive muscle disease that affects older adults, usually over the age of 50. Unlike other forms of myositis, IBM does not respond well to standard treatments.
✔ Asymmetric Muscle Weakness – Unlike polymyositis, IBM weakness is often not symmetric.
✔ Affects Hands and Legs – Grip strength weakens, and quadriceps (thigh muscles) atrophy, leading to frequent falls and difficulty walking.
✔ Mild to No Pain – Unlike other myositis types, IBM may not cause significant muscle pain.
✔ Swallowing Difficulties (Dysphagia) – Affects up to 60% of patients.
If you have progressive muscle weakness and are over 50, IBM should be considered. Get a myositis specialist’s opinion at Rheumatologist OnCall.
Statin-Induced Myositis – Autoimmune Reaction to Cholesterol Medications
Statins (cholesterol-lowering drugs) can, in rare cases, trigger an autoimmune attack on muscle tissue, leading to chronic muscle inflammation and weakness even after stopping the medication.
✔ Persistent Muscle Weakness After Stopping Statins
✔ Elevated CK Levels (Muscle Damage Marker)
✔ HMGCR Antibody Positive – A specific antibody linked to statin-induced myositis.
If you developed muscle weakness after taking statins, you may have statin-induced myositis. Schedule a consultation for expert evaluation.
How is Myositis Diagnosed?
Diagnosing myositis requires a combination of symptoms, lab tests, imaging, and sometimes muscle biopsy.
- Blood Tests – CK (Creatine Kinase), Aldolase, ANA, Myositis-Specific Antibodies (e.g., Anti-Jo-1, Anti-SRP, Anti-Mi-2).
- Electromyography (EMG) – Measures electrical activity in muscles to assess for inflammation.
- MRI of the Muscles – Detects inflammation, muscle damage, and edema.
- Muscle Biopsy – Helps confirm myositis and determine the specific type.
If you suspect myositis, early testing and treatment are essential to prevent long-term disability.
What Are Our Treatment Options for Patients with Myositis?
At Rheumatologist OnCall, our goal is to control inflammation, prevent muscle loss, and improve mobility.
Treatment is tailored to the specific type of myositis and may include
- Corticosteroids (Prednisone) – First-line treatment for most types of myositis.
- Immunosuppressants – Methotrexate, Azathioprine, Mycophenolate Mofetil.
- IVIG (Intravenous Immunoglobulin) – Used for severe or resistant cases.
- Biologics (Rituximab, JAK Inhibitors) – Emerging options for treatment-resistant cases.
- Physical Therapy & Rehabilitation – Helps restore muscle strength and prevent further weakness.
Myositis is a serious condition, but early treatment can make a huge difference. Start your personalized treatment plan today!
Why Choose Rheumatologist OnCall for Your Myositis / Inflammatory Care?
Expert Rheumatologists
Board-certified specialists with years of experience in treating myositis / inflammatory disease.
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Skip long wait times and get care from the comfort of your home or visit our clinic in Irvine, CA.
Holistic & Whole-Body Treatment
We integrate evidence-based medicine, lifestyle modifications, and precision medicine to prevent flares and long-term damage.
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Direct access to specialists without insurance barriers.
Early diagnosis and treatment help prevent future flares and joint damage.
