The reasons for leg cramps at night are the following: 1, caused by cold at night, such as the quilt is not covered, legs exposed, feel the wind and cold, so there will be cramps in the legs. 2, caused by calcium deficiency, especially the middle-aged and elderly people are prone to calcium deficiency after age, the common manifestation of calcium deficiency is leg cramps, calf muscle spasm, muscle bulge, the onset of muscle inactivity, very painful. 3, caused by sitting or standing for a long time during the day, resulting in calf muscle strain, can be relieved by lying in bed. In addition, calf muscle strain caused by sitting or standing for a long time during the day can be relieved by resting in bed. Therefore, according to the clinical situation, we need to determine which cause of calf cramps, if it is caused by calcium deficiency, usually take some calcium tablets or cod liver oil to relieve, if it is caused by cold, you need to cover thick blankets at night, and when cramps need to do hot compresses, massage, etc.