Old cramps in the calves may be caused by over fatigue, cold legs, lack of calcium and other reasons. 1. Excessive fatigue: If you exercise for a long time and overwork your legs, it will lead to the accumulation of a large amount of lactic acid locally in your calves, and if it can’t be broken down in a short time, it will be easy to have old cramps in your calves. 2. Cold legs: If the warmth measures are not in place, the calf muscles are stimulated by the cold, it is easy to appear spasm, thus appearing calf cramps. 3. Calcium deficiency: when the human body is deficient in calcium, the excitability of the muscles increases, and when the muscles are stimulated by the outside world, it is easy to cause muscle spasms, resulting in old cramps in the calves. Calf cramps may also be other reasons, it is recommended to consult a doctor in time to clarify the cause of the disease, under the guidance of the doctor for treatment.