The arm is not as thick as it should be according to the cause of treatment, common causes are strain and injury, local neuromuscular disease, cervical spondylosis, wastefulness, etc., the treatment includes medication, surgical treatment, rehabilitation exercise. 1. Strain and injury: due to chronic strain and acute injury caused by local edema, caused by the arm is not the same thick, should avoid chronic strain, take anti-inflammatory analgesic drugs such as celecoxib, ibuprofen, etc., and at the same time, external use of Yunnan Baiyao cream and other local compresses to reduce swelling. 2. Local neuromuscular diseases: peripheral neuritis and muscle inflammation can cause muscle dissolution, resulting in double arm is not the same thick, should be directed at the primary pathology for treatment, acupuncture treatment, while taking neurotrophic drugs such as vitamin B, methylcobalamin, etc., for the inflammation of non-steroidal anti-inflammatory drugs such as celecoxib, aspirin, etc.. 3. Cervical spondylosis: when cervical spondylosis is severe, it can compress the spinal nerves, and the nerves that innervate the upper limbs will not be as thick as the arms when they are compressed. The severity of cervical spondylosis should be ascertained, and if it is severe, surgical treatment is needed to relieve the nerve compression. 4. Wasting reason: due to work, one arm long-term high load operation and the other arm activities, there will be a side of the muscle development, the other side of the muscle underdevelopment, caused by the arm is not the same, can also be seen in the fracture trauma, such as long-term braking and rest, caused by the loss of muscle atrophy, should be adjusted to the arm activities or rehabilitation exercises. The arm is not as thick as there may be other reasons, should go to the hospital in time to find out the situation, according to the cause of targeted treatment. The above drugs need to be used under the guidance of a doctor.