Numbness of the skin may be caused by keeping the same posture for a long time, resulting in poor blood circulation, and may also be caused by cervical spondylosis, diabetes and other diseases. 1. Physiological factors: when the body maintains the same sitting position, sleeping position, etc. for a long time, it may lead to limb pressure, poor local blood circulation, skin numbness, limb weakness and other symptoms. The above situation is a normal physiological phenomenon, and can be gradually relieved in the short term. 2. Cervical spondylosis: For nerve root cervical spondylosis, patients will experience neck pain, numbness and other symptoms in the early stage, and some patients will experience radiating pain and skin numbness in the upper limbs due to the compression of the neck tissues to the nerve roots. Severe cervical spondylosis patients will also appear weakness, upper extremity heaviness and other symptoms. 3. Diabetes: some diabetic patients will be complicated by polyneuritis, patients will produce abnormal sensation of the extremities, such as tingling, burning sensation, sock-like changes. Skin numbness has more causes, it is recommended that timely medical treatment, so as not to lead to further aggravation of the condition.