What is myositis?
Myositis is a group of conditions involving chronic inflammation of the muscles. The inflammation may, or may not cause pain and weakness of the muscles. About 75,000 Americans have been diagnosed with myosotis. Myositis can be caused by numerous different things, but traditional myositis involves symptoms other than just muscle weakness and pain. Myositis usually has a gradual onset and may be unrecognizable in the beginning stages of the disease.
What are the different types of myositis?
There are two different types of myositis. They include:
- Polymyositis- a form of myositis that causes muscle weakness usually bilateral. It is known to affect the hips, thighs, shoulders, upper arms, and neck
- Dermatomyositis- a form of myositis that has the traditional symmetric muscle weakness but also involves skin manifestations in the form of a rash. The rash may present before, during, or after the episodes of muscle weakness. The locations the rash may appear includes:
- Necrotizing myopathy- a new form of myositis involving muscle death.
- Sporadic inclusion body myositis- this is the most common form of myositis.
- Juvenile forms of myositis- a category for myositis symptoms affecting anyone under the age of 18.