Small arm muscle soreness may be caused by lactic acid accumulation, muscle spasm or cervical spondylosis, etc., which can be treated by massage, hot compresses, ibuprofen and other medications. 1. Lactic acid buildup: When you do not do physical exercise for a long period of time and suddenly do strenuous exercise for a long period of time, lactic acid can not be completely decomposed and build up in the body, resulting in muscle aches and pains. The symptoms can be relieved by aerobic exercise to promote lactic acid metabolism or by applying hot compresses. 2. Muscle spasm: small arm muscle by cold stimulation, or muscle fatigue can cause muscle spasm and small arm muscle pain. You can massage and stretch the muscles to relieve the symptoms. 3. Cervical spondylosis: Herniated intervertebral discs, thickened ligaments, bone spurs, etc. can lead to spinal cord nerve root compression, so that the arm muscles and other symptoms such as soreness and weakness. Ibuprofen, diclofenac sodium and other drugs can relieve symptoms. If the symptoms of muscle pain in the lower arm cannot be relieved, patients need to go to the hospital for relevant examinations and get a diagnosis before they can determine how to treat the problem. Patients need to strictly follow the doctor’s treatment plan.