Shoulder numbness, common shoulder trauma, brachial plexus nerve injury and several other causes, as follows: a. Shoulder trauma: shoulder trauma with shoulder fracture, shoulder dislocation, acute strain of the shoulder joint, etc., can lead to local swelling of the shoulder, blood circulation disorders, local nerves will occur ischemia, hypoxia, nerve conduction dysfunction, will lead to local numbness, and accompanied by local activity restrictions, shooting X-ray film can confirm the existence of fracture dislocation, after cold compresses, patients braking, rest, numbness symptoms will gradually ease. Brachial plexus nerve injury: the brachial plexus nerve is compressed in the process of travel, or the brachial plexus nerve strain occurs in the process of movement, can cause numbness in the shoulder area, serious cases will also be accompanied by upper limb weakness, the patient’s upper limb muscles will appear secondary atrophy, through electromyography and other tests will find the extent of the injury, after timely treatment can make the brachial plexus nerve gradually recover.