Arm numbness is considered to be caused by excessive exercise, frozen shoulder, nerve entrapment disease, cervical spondylosis and other reasons. 1. Excessive exercise: such as excessive exercise or overwork of the upper limbs, causing the accumulation of lactic acid within the arm muscles, causing physiological numbness, swelling and pain and other symptoms, generally can be relieved after rest. 2. Frozen shoulder: It is caused by chronic strain and degeneration of the joint capsule, ligaments and other tissues of the shoulder. These factors will cause aseptic inflammation of the periapical tissues, and when the peripheral nerves are stimulated, it will cause shoulder arm pain and numbness. 3. Nerve compression diseases: such as thoracic outlet syndrome, elbow tube syndrome, etc., these diseases will cause compression of the brachial plexus nerve, ulnar nerve, etc., which will cause numbness and soreness of the arm in the innervated area. 4. Cervical spondylosis: such as cervical disc herniation, osteophytes and other lesions, when the nerve root for the compression caused by the time, but also radioactively cause arm numbness symptoms. Visible causes of arm paresthesia are very many reasons, such as serious symptoms or rest has been unable to relieve, should go to the hospital in a timely manner to further identify the cause of the disease, and then comply with the doctor’s instructions for targeted treatment, so as to avoid delays in the condition.