Little finger numbness, the main alert four diseases, as follows: 1, radicular cervical spondylosis, which is due to the cervical spine part of the intervertebral disc herniation or nerve root canal stenosis, it will compress the cervical spine part of the nerve root, resulting in ischemia of the nerve bundle inside, will cause the little finger numbness. 2, ulnar nerve problems, such as elbow-tube syndrome or ulnar nerve injury, it may be The nerve bundle of the ulnar nerve may be ischemic, which may cause numbness of the little finger. 3, due to the ulnar artery vascular problems, such as the deep branch of the ulnar artery after the formation of thrombus, will lead to the distal nerves of the blood supply decline and numbness of the little finger. 4, cerebral vascular hemorrhage, or cerebral infarction, brain tumors may compress the brain nerves of the brain, and there will be numbness of the little finger.