The child’s left hand numbness may be due to cold, posture pressure for too long and other physiological reasons, as well as cervical spine disease, elbow tube syndrome and other pathological reasons. 1. Physiological reasons: the child’s left hand numbness may be due to the left hand is cold, or the same position for a long time compression of the left hand for a long time, resulting in blood circulation obstruction, which is a normal physiological reaction do not worry too much. 2. Pathological reasons: some diseases may also lead to the child’s left hand numbness, common diseases are cervical spondylosis, elbow-tube syndrome and so on. Cervical spondylosis may cause compression of the left arm nerve, which may be manifested as the symptom of numbness in the left hand; elbow-tube syndrome may lead to abnormal morphology and structure of the elbow tube, which may cause compression of the ulnar nerve and lead to numbness in the hand. The child’s left hand numbness, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.