Weakness in hand grip is mainly characterized by a lack of strength when holding an object in the hand. Weakness in hand grip can be caused by conditions such as nerve entrapment syndrome of the hand, pre-spinal cord syndrome, cervical spondylosis, and tennis elbow. Nerve entrapment syndrome is one of the bone-fiber canal and compartment compression syndromes. For the peripheral nerve line a certain part of the bone fiber tube, a few for the fiber edge is compressed and chronic injury caused by inflammatory reaction, resulting in abnormal nerve function. The etiology of hand grip weakness: 1, ulnar canal and bean – hook cleft is composed of bone and lack of elasticity of the tendinous ligament, and is located in the frequent activities of the wrist joint, repeated activities of the wrist joint, flexion and extension of the little finger and the ring finger, the root of the palm continued to press hard objects, etc., can be made to carpal tunnel bean bone and hook bone around the soft tissue damage, so that they are inflammatory, hypertrophic, scarring, can be irritated and compression of the ulnar nerve through the ulnar nerve. 2, ulnar canal inlet, because the strap is too tight and long-term card pressure, friction; sleep pillow hand position compression of carpal tunnel bone, hook bone time is too long, so that the carpal tunnel bone radial edge, hook bone ulnar edge of soft tissue damage, ischemic curvature, scarring tissue irritation and compression of ulnar nerve. 3, ulnar nerve and ulnar artery line, periarterial inflammation, ulnar artery embolism, etc. can stimulate the ulnar nerve and onset.