Polymyositis involves inflammation of which body part?

Polymyositis is a type of inflammatory myopathy characterized specifically by inflammation and weakness of several muscles, particularly those closest to the trunk of the body, such as the hips, thighs, and shoulders. The condition is an autoimmune disorder where the immune system mistakenly attacks healthy muscle tissue, leading to muscle weakness and discomfort. This targeted muscle inflammation distinguishes polymyositis from other conditions that may involve different body tissues or types, such as organs, blood vessels, or nerves. Understanding that polymyositis primarily affects muscle tissue helps clarify its symptoms and guides treatment approaches focused on managing muscle inflammation and improving strength.