Frequently associated symptoms or sometimes a symptom of myositis include. Arthritis or joint pain as the fingers, wrist, ankle, knee, often with many on both sides simultaneously. Sometimes doctors misdiagnosed as arthritis, rheumatoid handlers in patients Thailand found that the pain associated with up to 85 percent of muscle pain by the arm and legs of 40 percent of dysphagia 35 percent. All patients with weight loss, especially in patients with severe symptoms, dysphagia, and patients with cancer may be associated with weight loss of 5-10 pounds within 2-3 months.