The cause of itchy back after acupuncture is considered to be a physiological phenomenon, which is related to the acupuncture site stimulated by needles; it may also be a pathological phenomenon, such as allergy to metal needles or the body is too weak and so on. 1. Physiological phenomenon: due to the sensitivity of the local skin, when stimulated by needles, it is easy to appear temporary itch, which is a normal physiological response, generally do not need special treatment, will be relieved in a short period of time. 2. Pathological phenomenon: (1) Allergy to metal needles: Due to allergy or low immunity, when stimulated by acupuncture metal needles, an allergic reaction occurs, showing the above symptoms. It is necessary to give anti-allergy treatment in time to promote early recovery. (2) The body is too weak: due to the patient’s weakness, acupuncture has the effect of activating blood circulation and removing blood stasis, dredging the meridians and so on, but the body’s adaptive ability is poor, showing the above symptoms. It is recommended to consult the doctor in time and follow the doctor’s instructions to give symptomatic conditioning or treatment. It is recommended to consult a doctor in detail before acupuncture, go to a regular hospital according to their own situation, grasp the precautions and adverse reactions of acupuncture treatment, etc., and notify the doctor in a timely manner when you find an abnormality, so as to ensure the safety of the treatment.