Myositis is a general term for inflamation of the muscles. Myositis can take several forms, usually develops slowly over time and can range in severity from mild to debilitating. Myositis may be associated with inflammation in other organs, including the joints, heart, lungs, intestines and skin. Both children and adults can get it.
Cause of myositis: 
- trauma
- infection
- strain
- autoimmune disease – it is not known what triggers the immune system’s attack –
Signs and symptoms:
- Muscle pain is often a first sign of myositis – myositis commonly involves the neck, shoulders, chest, back
- Muscle weakness
- Local muscle spasm
- General tiredness and fatigue
- Fever is only evident if the condition is part of a general infection
- Pain climbing stairs, standing from a seated position, or reaching up
- Difficulty swallowing
Treatment: – Many people with myositis respond well to treatment.
- Medications
- Physical therapy to improve physical activity ( individualized regular exercise routine) – it is an important part of the treatment
- Supplements