1, the infraspinatus muscle can cause numbness and discomfort on the radial side of the hand. Some patients feel numbness and discomfort throughout the arm, and when the affected side sleeps and presses the infraspinatus muscle, the numbness in the upper extremity increases, and patients often complain that the numbness increases at night, concentrating on the radial fingers. Some patients are accompanied by discomfort in the lateral upper arm, lateral forearm and pain at the medial edge of the scapula. Superficial pain sensation in the chest. The treatment location is equivalent to the triceps treatment area under the silver needle post. 2. The subclavian muscle causes upper extremity conduction pain that runs down the radial side of the forearm in front of the shoulder, but does not present symptoms at the joint. It involves numbness and pain on the radial side of the hand and the dorsal side of the index and middle fingers of the thumb. Thoracic outlet syndrome. The treatment location is equivalent to the subclavian treatment area of the silver needle. 3, the pectoralis minor muscle fascia itself can cause numbness in the arm, mainly concentrated on the ulnar side, radiating to the lesser trochanter, the lesser thumb and the ring finger. If the pectoralis minor muscle tension becomes short it can lead to axillary artery and axillary vein entrapment, resulting in upper limb edema or pulselessness in the raised hand. ① The pectoralis minor and the inferior trapezius muscles are antagonistic to each other. Weakness of the inferior trapezius and over tightness of the pectoralis minor muscle can lead to pterygoid scapulae (pulling the subscapular angle of the scapula forward and downward and the medial edge of the scapula away from the rib cage). (ii) Numbness in the hand caused by the middle bundle of the pectoralis major and pain in the medial elbow joint, but the pectoralis major, unlike the pectoralis minor, does not cause vascular and nerve entrapment. ③The treatment location of pectoralis minor and pectoralis major is the same as shown above, but there is a risk of needle entry here, and one should be familiar with the anatomy. 4. The superior posterior serratus causes numbness on the ulnar side of the forearm and wrist palm, finally reaching the little finger. Some patients are accompanied by deep scapular pain, which is the strongest fissure deep in the upper scapula and extends to the posterior deltoid, triceps area, and elbow hawk area, and the patient complains that the pain is also present at rest. Treatment: Silver needle acupuncture at 1.5-2.5 cm next to the C6-T2 spinous process, equivalent to treating the attachment area of the upper posterior serratus at the C6-T2 spinous process. It is equivalent to treating the cervical and thoracic vertebral plate treatment area with silver needle. 5. The latissimus dorsi muscle causes persistent soreness in the subscapularis angle and the surrounding mid-back, and in severe cases can produce numbness and discomfort along the upper arm, forearm and ulnar side of the hand by conduction. It cannot be relieved by changing the posture and pulling (different from the oblique muscle) 6. The oblique muscle can cause numbness and tingling in the hand, accidental dropping of things, and a feeling of stiffness in the finger joints. The stiffness is caused by the oblique muscle secondary to the forearm extensor group. The trapezius can also cause pain in the chest, back of the shoulder, lateral upper extremity and inner edge of the scapula. Sometimes it resembles tennis elbow and frozen shoulder. Thoracic outlet syndrome, compression of blood vessels and lymphatic appears as hand edema. Treatment: Treatment area of the anterior and posterior cervical nodes of C3-C6, treatment of part of the attachment area of the oblique angle muscle.