Numbness of the little finger may be caused by improper sleeping posture, cardiovascular and cerebrovascular lesions, neuropathy, local tumors and other factors. 1. Improper sleeping position: improper sleeping position compresses the nerves and blood vessels of the arm, resulting in insufficient blood supply and oxygen supply to the fingers, and the symptoms of numbness of the little finger will appear. 2. Cardiovascular and cerebrovascular lesions: atherosclerosis, thrombosis, etc. can lead to abnormal blood vessel function, and the little finger will become numb due to lack of blood. 3. Neuropathy: the dysfunction of the nerves controlling the little finger can also cause symptoms of numbness of the little finger, and common diseases include cervical spondylosis, carpal tunnel syndrome, multiple peripheral neuritis and so on. 4. Local tumor: when the tumor compresses or violates the blood vessels and nerves of the little finger, it will also cause the symptoms of tingling in the little finger. It is recommended that patients identify the cause of the disease in time and carry out relevant treatment under the guidance of physicians.