The causes of numbness in the arms and fingers are as follows: a. If the patient has numbness in one arm or finger, it can be clinically seen as a result of cerebrovascular disease and intracranial occupational disease. Numbness in the arms and fingers caused by intracranial occupancy usually appears slowly and is accompanied by headache, and the diagnosis can be confirmed after CT or MRI examination of the head. If the numbness in the arms and fingers is bilateral, it is more common in clinical cervical spondylosis, where the protruding cervical discs lead to stimulation of the dural sac and nerve roots, resulting in numbness in the arms and fingers, and the symptoms are more obvious after a long sleep. Third, for arm and finger numbness, clinically it can also be seen in local nerve compression, such as cervical and shoulder frozen shoulder or elbow tunnel syndrome, carpal tunnel syndrome, the patient appears arm and finger numbness.