Numbness of arm in patients may be related to cerebrovascular disease, peripheral neuropathy, cervical spondylosis and other factors. 1. Cerebrovascular disease: when patients suffer from cerebrovascular disease, such as cerebral ischemia, stroke, etc., it may cause cerebrovascular circulatory disorders or cerebral tissue damage, which may lead to numbness of the arm. 2. Peripheral neuropathy: it is mostly seen in patients with long-term diabetes, which can lead to diabetic peripheral neuropathy, and the phenomenon of numbness of the hand can also occur. 3. Cervical spondylosis: when the patient suffers from cervical spondylosis, due to cervical spondylotic hyperplasia and disc herniation, the nerves innervating the upper limbs are compressed, and thus numbness of the arm may occur. In addition, improper sleeping posture, elbow tube syndrome and other diseases, may cause numbness of the arm, it is recommended that patients seek medical examination in a timely manner to clarify the cause of the targeted treatment.