Children’s leg cramps, usually due to growth and development, mostly related to low calcium, this time to make up the calcium, not easy to appear cramps. In addition, like patients with poor renal function have cramps, this situation is also related to low calcium, but the reason is mainly related to the patient’s hypocalcemia, and may also be related to the accumulation of urinary toxins and other factors. Patients with poor renal function have poor absorption of calcium, so this patient is often prone to hypocalcemia, attention should be paid to timely supplementation of the patient, you can give the patient with calcium carbonate D3 or osteotriol, etc., after the calcium supplementation up, the number of cramps will be reduced or even no. But for children, it is often not the case of low calcium, but this is also related to low calcium. However, for children, cramps are often not caused by the kidneys, and are generally related to the child’s growth and development.