what is polymyositis symptoms
Polymyositis is a systemic disease, which means it affects the whole body. Muscle weakness and tenderness can be signs of polymyositis. A rash is a sign of a similar condition, dermatomyositis.Common symptoms include: 1  Difficulty swallowing.2  Muscle pain. 3  Muscle weakness in the proximal muscles (shoulders, hips, etc.) this can make it hard to raise the arms over the head, get up from a sitting position, or climb stairs.ack to Top Symptoms. Polymyositis is a systemic disease, which means it affects the whole body. Muscle weakness and tenderness can be signs of polymyositis. A rash is a sign of a similar condition, dermatomyositis. Common symptoms include: 1  Difficulty swallowing. 2  Muscle pain.