Patients with itchy nipples may be stimulated by external factors such as poor hygiene and underwear friction, and are not a harbinger of disease. In addition, it may be related to a variety of causes, including eczema, sebaceous cyst infection, breast enlargement, and even breast cancer. 2, sebaceous cyst infection: If a patient has an infection of the sebaceous cyst in the nipple area, it may also manifest as itching, usually accompanied by redness, swelling, pain and other symptoms, and in serious cases, pus; 3, breast hyperplasia: In addition to breast pain, breast lumps and other symptoms, breast hyperplasia patients may also be accompanied by itchy nipples, usually related to estrogen level disorders, common in menstruating and pregnant women; 4, breast cancer: Early stage breast cancer patients may be accompanied by itchy nipples. , breast cancer: Patients with early stage breast cancer usually have no obvious conscious symptoms. If the disease is not detected and treated in time, resulting in aggravation, nipple itching may occur, usually accompanied by breast lumps, nipple overflow, abnormal breast skin and other symptoms. If the disease enters the middle and late stage, it may show symptoms such as anorexia, weakness, anemia, etc. If there is metastasis, it may also be accompanied by other abnormal manifestations of metastatic sites.