Patients sleeping at night with numbness in the left hand are mainly considered to be signs of the following diseases: firstly, they should be considered to be caused by cervical spondylosis, this type of patients may have cervical spine bone degeneration, cervical disc herniation or bony stenosis of the cervical spinal canal, when the patient sleeps in an improper posture, it will easily lead to nerve root pressure and symptoms of numbness in the left hand; secondly, if the patient is an elderly person with The second aspect is that if the patient is elderly, has risk factors for cerebrovascular disease, diabetes, hypertension, hyperlipidemia, hyperhomocysteinemia, as well as smoking and alcohol consumption, the numbness in the left hand at night should also be considered a cerebrovascular disease, such as cerebral infarction, transient ischemic attack, which affects the patient’s sensory nerves will appear this symptom, and must be promptly diagnosed and treated.