Children often hand numbness may be caused by calcium deficiency, improper sleeping posture, central nervous system diseases and other factors. 1. Calcium deficiency: If the child’s long-term calcium intake is insufficient, it will affect the growth and development of bones and muscles and nerves, resulting in numbness of the child’s hands and feet, and even cause abnormal neuromuscular activity and cramps in the hands and feet and other phenomena. 2. Improper sleeping position: when sleeping in an improper position at night, the hand will be in a long-term pressure state, which will lead to poor blood circulation in the hand and cause hand numbness. 3. Central nervous system diseases: If the central nervous system is infected by viruses, bacteria and other infections or the central nervous system has occupational lesions, it may lead to numbness of the hand. Therefore, the child often hand numbness, parents should pay attention to, take the child to the hospital in a timely manner.