If it is numbness in one arm or finger and it is sudden, it is considered to be caused by cerebrovascular diseases, more commonly ischemic cerebrovascular diseases, such as cerebral infarction and transient ischemic attack. Patients mostly have risk factors for cerebral atherosclerosis, such as hypertension, hyperglycemia, as well as smoking and alcohol consumption. An MRI or CT examination of the head can be performed, and treatment should be given for cerebrovascular disease after the diagnosis is confirmed. In case of numbness in the arms and fingers on both sides, cervical spondylosis is more common in clinical practice. Numbness in the arms and fingers may occur due to irritation of the dural sac and nerve roots by the protruding cervical discs, and may be accompanied by neck discomfort. It can also be seen clinically as localized entrapment, such as frozen shoulder or elbow tunnel syndrome, carpal tunnel syndrome, etc., where localized numbness in the arm and numbness in the fingers can occur due to nerve entrapment.