Nipple pain after pregnancy may be a normal physiological phenomenon, such as changes in hormone levels, or it may be caused by diseases, such as breast hyperplasia and mastalgia. 1. Estrogen and progesterone levels increase after pregnancy, when stimulated by hormone levels, the breast mammary glands will proliferate, which is a normal physiological phenomenon and generally does not require treatment. 2. Breast Hyperplasia: If there is a hormone level disorder in the body, such as an imbalance in the ratio of estrogen and progesterone, it will cause excessive or incomplete recovery of the breast gland, thus causing breast hyperplasia. This is a benign breast disease, and after pregnancy, estrogen rises significantly, so there will be obvious symptoms. 3. Mastodynia: Mastodynia is a disease without organic changes, and is related to a variety of factors, such as excessive mental tension, stress, endocrine disorders, etc. This pain is usually a diffuse dull pain or limited stabbing pain, aggravated by touching or polka dots. Nipple pain after pregnancy can relax the spirit, distraction, moderate more rest, if not relieved to seek medical attention as soon as possible, regular pregnancy test.