Muscle aches
Pain and aches in the muscles are common in people with chronic pain syndrome. Often, muscle pain also involves ligaments and fascia (a sheet of connective tissue that connects muscle, organs, and bones). Chronic pain tends to involve specific muscle groups in the body, such as back muscles, shoulder muscles, thigh muscles, and muscle of the shin.
The most common body conditions that can lead to chronic muscle pain include general body infections such as the flu, muscle infections, and certain connective tissue disorders such as lupus erythematosus. Another common cause is fibromyalgia, a neurological condition that can lead to chronic muscle and neuropathic pain.