If the arms are small, the cause must be diagnosed, whether it is due to pathological factors or non-pathological factors. Patients are thin, the human skeleton is relatively small, so small arms are normal, if the patient’s body does not appear abnormal, generally do not need to be treated. However, it is clinically advisable for patients to strengthen their nutrition and physical fitness. If the patient is affected by tendonitis, deltoid damage and other factors, the development of the arm is hindered, causing the phenomenon of small arms, promptly go to a tertiary care hospital to do a detailed examination, diagnose the cause, and then carry out targeted treatment; if it is caused by inflammation, clinical anti-infection and anti-inflammatory treatment is generally carried out. If it is caused by muscle damage, pay more attention to rest during this period, do not lift heavy objects, take massage, massage and other ways to regulate, pay attention to arm warmth, to avoid its cold, serious patients need to take surgery to treat.