Nipple inversion is clinically judged by the nipple morphology, if the nipple is lower than the areola plane then it is nipple inversion, then it belongs to nipple inversion. The clinical manifestation of nipple inversion is more typical, and it is diagnosed and typed directly through the clinical manifestation. The nipple is lower than the areola plane can be diagnosed. In mild cases, the nipple can be extruded manually without retraction; in severe cases, the nipple is completely sunken under the areola and difficult to be extruded, which is often accompanied by eczema and acne-like growths. Patients with inverted nipples are advised to go to the hospital to confirm the possibility of mastitis through breast ultrasound and other examinations. After diagnosis, patients with mild cases can be treated without special treatment, and the symptoms can be relieved by pulling the nipple on their own for a long period of time, while patients with severe cases can be treated with surgical operation according to the doctor’s advice.