Cramps are a common name for muscle spasms that can occur throughout the body, but most often in the lower legs. There are many causes of calf cramps, first of all, cold and cold, because the blood vessels in the legs will contract when cold and cold, which will cause the blood circulation in the calves to drop, leading to cramps, which will be relieved by hot compresses, and will not last too long. In addition, after overexertion and exercise can also lead to calf cramps, which are caused by the amount of exercise beyond the load on the legs, and will be relieved by resting and pressing the symptoms. Cramps can also occur in the elderly and adolescents due to calcium deficiency, which can occur throughout the body and can be relieved by calcium supplementation.