Right arm weakness is mostly considered to be caused by cervical spondylosis, rheumatoid arthritis, cerebrovascular disease, etc., which can be treated by physical and medication methods. 1. Cervical spondylosis: the right arm weakness caused by cervical disc degeneration and its secondary changes, manifested as pain and numbness in the back of the neck, dizziness, upper and lower limb weakness, can be treated with medicines such as glucosamine sulphate, chondroitin sulphate, ethylpiperidinone, chlorzoxazone and so on. 2. Rheumatoid arthritis: Rheumatoid arthritis is a connective tissue inflammation characterized by joint and muscle wandering soreness, redness, swelling and pain, which in turn triggers right arm soreness, weakness, pain and irregular fever. Rheumatism treatment should be as early as possible reasonable, joint medication, available drugs are aspirin, ibuprofen, diclofenac sodium, loxoprofen sodium and so on. 3. Cerebrovascular disease: affecting cerebral blood vessels and blood supply to the brain and thus leading to right arm weakness, accompanied by dizziness, headache, hemiplegia, blurred consciousness and other symptoms, which can be treated by taking alteplase, warfarin, aspirin and medicines for the treatment of primary. If the pain is persistent, we should pay attention to it and strengthen the observation of the affected area. If the pain is intolerable and there is no obvious improvement after a period of medication, we should consult a doctor in time. The above drugs should be used under the guidance of a doctor, avoid self-medication.