Numbness of three fingers may be a normal physiological phenomenon, or it may be caused by diseases, such as peripheral neuropathy, central neuropathy, vascular lesions and so on. 1. Physiological reasons: maintaining a posture for a long time will compress the nerves and blood vessels, resulting in poor blood circulation, which may cause numbness in three fingers. It can be relieved after relieving the compression. 2. Disease Causes (1) When the local nerve or nerve root is compressed, irritated or infected, it will cause peripheral neuropathy, thus causing abnormal nerve symptoms. For example, cervical spondylosis, carpal tunnel syndrome, multiple peripheral neuritis, etc., may lead to the symptoms of numbness in three fingers. (2) Some brain diseases, such as cerebral hemorrhage, cerebral infarction, brain tumors, etc. can lead to central nervous system damage, resulting in sensory disorders, limb disorders, etc., which may lead to the symptoms of numbness of the three fingers. (3) diabetes long-term condition of repeated blood sugar instability may cause diabetic peripheral neuritis, may cause three fingers numbness symptoms. The symptoms of numbness of three fingers should be timely medical treatment, according to the clinical symptoms and examination results of comprehensive diagnosis, under the guidance of the doctor to correct treatment.