Patient: numbness in the little finger when sleeping Illness: don’t know Description (onset, main symptoms, hospital visited, etc.): Sometimes I feel numbness in the little finger when sleeping and wake up suddenly. Recently, it is mostly seen in the left hand. I have had it in my right hand as well. I don’t know what this problem is. No treatment. Please diagnose. Yuan Yi, Department of Orthopedics, Ningbo Second Hospital: The ulnar nerve innervates the little finger, and ulnar nerve compression can be seen in carpal ulnar canal entrapment, elbow canal syndrome, thoracic outlet syndrome, nerve root type cervical spondylosis, etc.. That is, such symptoms may occur at any nerve passage site. If both sides occur at the same time, it is mostly caused by cervical spondylosis, and the symptoms are not serious, so it can be temporarily left untreated or appropriate physical therapy.