Which of the following is a condition of widespread connective tissue and muscular pain and often includes severe fatigue of unknown origin?

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Fibromyalgia is a condition of widespread connective tissue and muscular pain and often includes severe fatigue of unknown origin. Myasthenia gravis is a chronic autoimmune neuromuscular disease of unknown origin that affects voluntary muscle contraction. Muscle spasms occur spontaneously and may persist for hours. They typically are caused by heavy exercise and muscle fatigue, but they also can be caused by dehydration, hypothyroidism, lack of calcium or magnesium, kidney failure, and alcoholism. Muscle spasms can be quite painful.

Which of the Following Is a Condition of Widespread Connective