Itchy nipples may be related to pregnancy, eczema, breast cancer and other diseases. 1. Pregnancy: When a woman is pregnant, her body’s estrogen and progesterone levels will rise, which will promote breast development. During the secondary development of breasts, itchy nipples may occur. 2. Eczema: Eczema is a chronic inflammatory itchy skin disease. If the breathability of daily underwear is poor, or the nipple is in a moist environment for a long time, it may cause nipple eczema and nipple itching. 3. Breast Cancer: Breast cancer is the uncontrolled proliferation of breast epithelial cells, which leads to malignant changes. Breast cancer can lead to abnormal nipple areola, and if it is a special type of breast cancer, such as nipple eczema-like cancer, it can lead to itching of nipple, areola and its surrounding skin. Itchy nipples should also be considered for other causes such as mastitis, the causes are different, the specific intervention methods will be different, it is not recommended to treat privately to avoid improper treatment methods.