Myositis is a general term for inflammation of the muscles.
Many are considered likely to be caused by autoimmune conditions, rather than directly due to infection (although autoimmune conditions can be activated or exacerbated by infections.)
Elevation of creatine kinase in blood is indicative of myositis.
Types of myositis include:
- myositis ossificans
- idiopathic inflammatory myopathies
- inclusion body myositis