Recently, I have a number of friends private letter, asking what is the reason for waking up in the morning to find arm numbness, generally speaking, if it is a temporary numbness after a while not numb, that may be due to your poor sleeping posture, sleep compression to the upper limbs, so that the blood vessels and nerves in the arms are compressed, causing a temporary poor blood supply and numbness, that as long as the activity will be good. But if the arms continue to numb after getting up, there are generally two possibilities: 1, cervical spondylosis: the most common disease that causes hand numbness is cervical spondylosis, which is one of the diseases that occur in the elderly, the common clinical manifestations of cervical spondylosis is neck discomfort, nausea, dizziness, headache, weakness, etc., compression of the brachial plexus nerve, resulting in numbness and discomfort in the limbs. 2, stroke: another common disease that causes hand numbness is stroke, for middle-aged people over 40 years old, if there are often headaches, dizziness, head heavy, numbness, tongue swelling and other symptoms, and patients usually have hypertension, hyperlipidemia, diabetes, cerebral arteriosclerosis and other diseases, should pay more attention to the occurrence of cerebral infarction, cerebral hemorrhage and other cerebrovascular diseases.