The left side of gay men appear a little numbness in the hand, mainly for three reasons: First, the nerve root type cervical spondylosis, due to inflammatory hyperplasia, disc protrusion, intervertebral foraminal stenosis, etc., for the nerve root extrusion, stimulation, resulting in nerve fiber ischemia, may also lead to numbness in the nerve distribution area related to the hand, usually in the top of the head when the pressure has numbness symptoms aggravated The numbness may be aggravated by pressure on the top of the head. Second, the brachial plexus nerve, radial nerve, median nerve, ulnar nerve and other nerve tissue around the foci of irritation, such as local hyperplasia, calcification, adhesions, the emergence of fibrous tissue, may lead to extrusion of the nerve bundle, irritation resulting in ischemia, will also appear a little numbness in the hand, especially the median nerve, mainly manifested in the palm of the hand against the radial side of the three and a half finger numbness, ulnar nerve is The ulnar nerve is numbness in the ulnar side of the little finger and ring finger, and the radial nerve is numbness in the thumb, index finger and middle finger on the back of the hand, and in the ring finger on the radial side. Third, it may be caused by inappropriate sleeping posture, such as lying on the side during the night, resulting in the shoulder joint parts or arm parts of the body squeezed for too long, which also easily leads to nerve tissue ischemia, manifested as numbness in the hand.