If there is a painful symptom like cramps in the calf, it is mainly caused by muscle and fascia spasm and edema in the calf area, mainly due to the following reasons: First, it is seen in calcium deficiency, especially in adolescents and middle-aged and elderly people in the growth period, after the calcium deficiency will lead to muscle spasm in the calf area, thus causing obvious cramps in the calf area. Second, see in the strain, cold caused by myofasciitis, will be at rest when the obvious calf muscle spasm, edema, resulting in obvious calf area cramps symptoms. Third, see in trauma, especially violent squatting, running and jumping activities lead to calf muscle, fascia stretching, injury, edema, will also lead to obvious cramps in the calf, especially at night when resting pain is particularly obvious.