Numbness of both arms may be caused by long-term chronic strain injury of both arms, cervical disc herniation, Guillain-Barré syndrome and other reasons. 1. Chronic strain injury: long-term hand work, such as sorting, sewing, wall building, etc., can cause long-term chronic strain injury to the muscles, joints, ligaments, etc., causing congestion, edema and other aseptic inflammation, resulting in pain, numbness, swelling and other discomforts in both arms. 2. Cervical disc herniation: Cervical disc herniation can irritate and/or compress the nerve roots in the neck, causing sensory abnormalities and dyskinesia in the upper limbs bilaterally, and symptoms such as neck, shoulder and back pain accompanied by radiation from the upper limbs, numbness, weakness of the upper limbs, and instability in gripping are seen. 3. Guillain-Barré syndrome: a class of immune-mediated acute peripheral neuropathy, mostly due to the body’s immune response, often appearing decline in muscle strength and sensory sensitivity, the fingers and toes appear to wear gloves and socks-like sensation, the severe cases can appear neck and respiratory muscle weakness, resulting in dyspnea and other symptoms. Two arm numbness may also be diabetes and other diseases caused by peripheral neuritis and other causes, it is recommended to consult a doctor in a timely manner to clarify the diagnosis, under the guidance of the doctor for targeted treatment.