Breast reduction surgery is generally aimed at macromastia caused by oversized glands. Breast reduction surgery may have some hazards, such as anesthesia accidents, infections, and nipple areola necrosis. 1. Anesthesia accident: very few patients will have allergic reaction to anesthesia, which may lead to shortness of breath and local skin rash in mild cases, and anaphylactic shock leading to death in serious cases. 2. Infection: Bacteria or viruses may enter the body through instruments or endogenous infection during surgery. Patients may experience redness, swelling, heat, and pain, and need to be treated with antibiotics under the direction of a physician. 3. Necrosis of nipple or areola: Breast reduction surgery will rebuild the position of nipple and areola, which may cause localized necrosis of nipple and areola due to relatively small nipple and areola and low blood circulation around them. When resting after breast reduction surgery, patients should adopt a flat lying position, which is conducive to the recovery of breasts. Do not pull the patient’s upper arm with force after breast reduction surgery, and avoid strenuous activities to avoid injury and bleeding. Breast reduction surgery has a certain risk, so choose a regular hospital to carry out.