While each myositis condition has its own unique characteristics and treatments, all of them involve chronic muscle inflammation. This inflammation usually results in muscle fatigue and weakness, frequent falling, swelling of the feet and legs, and muscular and joint pain.
Early symptoms in patients with myositis include:
- Difficulty standing up from a seated position
- Difficulty climbing stairs
- Difficulty lifting the arms
- Fatigue after standing or walking a long time
- Trouble swallowing or breathing
- Muscle pain that does not subside within a few weeks
- A red or purple colored rash on the eyelids, elbows, knees and knuckles
Causes and Risk Factors
Juvenile myositis generally affects children from 5 to 15 years old.
Dermatomyositis can affect all ethnic groups and both genders; however, women have been shown to be twice as likely to develop the disease.
The risk of developing polymyositis increases with age and shows the highest rates of incidence between the ages of 35 to 44 and 55 to 64. Women are also twice as likely as men to develop polymyositis.
The risk of developing IBM increases with age and usually appears in patients over the age of 50; however, patients may develop symptoms as early as their 30s. IBM is twice as likely to develop in men as in women.