An inflammatory disease of muscles that causes pain and stiffness on both sides of the body, particularly the shoulders, neck, upper arms, buttocks, and thighs is

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The described symptoms are characteristic of polymyalgia rheumatica, which is an inflammatory disease that primarily affects people over the age of 50. Fibromyalgia also causes pain and stiffness, but it is not limited to specific regions of the body and can occur at any age. Myasthenia gravis and muscular dystrophy are both neuromuscular diseases that present with muscle weakness rather than pain and stiffness. Rhabdomyolysis is a condition where muscle tissue breaks down and releases harmful substances into the bloodstream, which can cause muscle pain and weakness, but it is not a chronic inflammatory disease.

An Inflammatory Disease of Muscles That Causes Pain and Stiffness