The causes of sudden numbness of the fingers include prolonged pressure, cerebrovascular disease, Guillain-Barré syndrome and so on. 1. Prolonged pressure: for example, the patient’s posture is not correct, and the pressure on the fingers and transient ischemia and hypoxia, resulting in sudden numbness of the fingers. The numbness of the hand will recover quickly after the pressure is lifted. 2. Cerebrovascular disease: such as cerebral thrombosis, cerebral infarction and other cerebrovascular diseases, usually in the quiet state of the onset of numbness in the fingers. 3. Guillain-Barré syndrome: the disease mainly develops from distal to proximal, hand numbness symptoms can occur, the more serious condition can involve the respiratory muscles and respiratory difficulties. Early symptoms of facial numbness and numbness at the corners of the mouth may also occur. There may also be other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.