Many symptoms of myositis are similar to that of other conditions.  Only diagnosis helps to differentiate myositis and any other diseases.

• Pain in muscles
• Tenderness in muscle
• Tiredness and feeling unwell
• Weight loss or weight gain
• Sweating during night
• Constant muscle pain
• Difficulty in doing day to day task
• Risk of falling due to weakness

What causes myositis?

Some people with preexisting autoimmune diseases are more likely to develop myositis  such as rheumatoid arthritis, scleroderma, lupus.

Sometimes after a severe viral infection one can develop myositis: the common cold, flu, AIDS/HIV

Image credit: Elizabeth M. Dugan, Adam M. Huber, Frederick W. Miller, Lisa G. Rider, CC BY-SA 3.0, via Wikimedia Commons