There are many reasons for muscle cramps. First, it may be caused by calcium deficiency. This situation is most common in pregnant women, the elderly or adolescents in growth and development period. Of course, calcium deficiency may affect the nerve conduction of skeletal muscles and cause muscle twitching. A trace element examination can determine that calcium and vitamin D need to be supplemented at this time, and at the same time, outdoor activities should be carried out every day to bask in the sun. Second, muscle twitching may be caused by overwork. In particular, the young and middle-aged people will have spasmodic pain and cramps in the muscles of the lower limbs, especially the lower legs, after 1 day of fatigue. At this time, they need to soak their feet or take a hot bath to alleviate fatigue.