Patients with symptoms of numbness in the five fingers of the left hand need to be alert to cerebral ischemia, cerebral infarction, diabetic peripheral neuropathy, neurogenic cervical spondylosis, somatization of sensory disorders, and other diseases, the specific causes and their treatments are as follows: 1. Cerebral ischemia, cerebral infarction: patients with cerebral atherosclerosis and other causes of cerebral ischemia, cerebral infarction will cause patients with distal limb sensory deficits, resulting in numbness of one or both limbs, pain symptoms, the patient can accept the cranial magnetic examination, according to the results of the examination, the choice of taking drugs to improve cerebral circulation, such as edaravone, or surgical thrombolysis, interventional thrombolysis treatment. 2. Diabetic peripheral neuropathy: diabetic patients can gradually appear as a complication of diabetic peripheral neuropathy with symptoms of numbness of the limbs, patients need to actively control blood glucose, and at the same time, take vitamin B6, methylcobalamin nutritional nerves, relieve symptoms. 3. Neurogenic cervical spondylosis: when the left nerve root of the patient is compressed, it can lead to ischemia and dysfunction of the nerves on that side, resulting in numbness of that side of the limb, and the patient needs to undergo intervertebral discectomy as well as to take nutritive drugs such as methylcobalamin to treat the nerves. 4. Somatization sensory disorder: long-term emotional tension, anxiety, mental stress of patients can be due to somatization sensory disorder and the emergence of abnormal sensory symptoms in many parts of the body, the patient needs to regulate the mood, adequate rest, and take olanzapine and other antidepressants to relieve the symptoms if necessary. The numbness of the five fingers of the left hand can be caused by a variety of reasons, it is recommended that patients go to the hospital as soon as possible to clarify the specific causes of the symptoms and receive appropriate treatment to avoid aggravation and deterioration of the condition.