Calcium, as one of the important elements in the human body, has an important positive significance to the formation of bones and the normal growth of various body tissues. Once the lack of calcium, it is easy to cause the normal absorption dysfunction of the digestive system, resulting in the lack of vitality of red blood cells, affecting the circulatory system, making the skin surface rough and chapped symptoms; also the neurological disability and stunted development, causing memory loss, insomnia and dreaminess; and may lead to muscle tonic spasm, which has an irreversible effect on the composition of muscle tissue. For children and adolescents, calcium deficiency not only affects height, but may also produce critical symptoms of heart disease, rapid heart rate, and insufficient blood supply due to lower blood calcium concentration. Especially after doing strenuous exercise, there will be muscle soreness and pain, or even a burning sensation. For middle-aged people, dysfunction of the ear, nose and throat may arise, with slurred speech, insensitive taste, hearing loss, and intermittent spasms accompanying the pharynx. In elderly people with calcium deficiency, the probability of osteoporosis and tenosynovitis will increase, and various spinal and joint diseases may appear and be accompanied by dizziness, cramps in the extremities, and in the later stages of the disease, stage convulsions may occur. The main symptoms of hypocalcemia are dizziness, easy fracture, panic and rapid heart rate. You can eat more foods with high calcium content or take calcium tablets directly to prevent and relieve the condition.