Numbness of the hands may be related to physiological factors, or it may be caused by diabetic peripheral neuropathy, central neuropathy and other reasons. 1. Physiological factors: such as sleeping in an improper position, writing for a long time, or pregnancy, may cause hand numbness. These triggers lead to hand numbness are normal phenomena, do not worry too much, and do not need special intervention. 2. Diabetic peripheral neuropathy: the disease can make the patient peripheral nerve damage, resulting in peripheral nerves can not get enough blood supply, may cause hand numbness symptoms, may also be accompanied by numbness of the feet, weakness and other symptoms. 3. central neuropathy: commonly found in brain tumors, brain abscess, cerebral infarction and other diseases, such as cerebral infarction, due to local ischemia of brain tissue, resulting in damage to the brain nerves in the area, may cause numbness of the hand symptoms, may be accompanied by dizziness, nausea and other neurological deficits. Hand numbness may also be caused by other reasons, if the hand numbness symptoms continue to be unable to alleviate, or combined with other symptoms of discomfort, should seek medical attention as soon as possible.