The symptoms of numbness in the left hand after waking up may be due to incorrect sleep posture, resulting in long-term compression of the left hand, which can lead to local blood flow is not smooth, causing ischemic symptoms, resulting in excessive lactic acid buildup causing numbness. 1, suffering from cervical spondylosis or hypertension, hyperglycemia, hyperlipidemia can cause, after suffering from cervical spondylosis, because the protruding discs compress the vertebral artery leading to 2, if the patient long-term blood pressure, lipid control is poor, will lead to increased blood viscosity, resulting in the formation of local microthrombosis, will also form cerebrovascular disease, resulting in local compression affect the peripheral nerve function, will also appear the symptoms of hand numbness.