What medical term describes the inflammation of muscle?

The correct term that describes inflammation of muscle is myositis. This condition specifically refers to the inflammation of skeletal muscle, which can be caused by various factors including autoimmune diseases, infections, or trauma. Myositis can result in symptoms such as muscle weakness, tenderness, and swelling, which are direct consequences of the inflammatory process affecting the muscle tissue.

In contrast, myopathy refers more broadly to any disease or disorder of the muscle, which may not necessarily involve inflammation. Fibromyalgia is a chronic condition characterized primarily by widespread pain and fatigue, without specific inflammation of muscle. Myelitis refers to inflammation of the spinal cord and is not related to muscle tissue at all. Thus, myositis is the appropriate term associated with muscle inflammation.