Abdominal cramps and nipple swelling and pain may be related to pre-menstrual reaction, pregnancy, gynecological diseases, breast diseases and other conditions. 1. Pre-menstrual reaction: Before the onset of menstruation, a woman is in the luteal phase, and the patient’s hormone levels will change, resulting in symptoms such as abdominal swelling, breast sensitivity, breast pain, etc. With the arrival of menstruation, the symptoms will gradually recover. 2. Pregnancy: If a woman has passed her menstrual cycle and has not yet had her period, the symptoms may be caused by early pregnancy. After pregnancy, women may have abdominal cramps and pain, breast sensitivity and other phenomena. 3. Gynecological diseases: It may be simple gynecological diseases that cause abdominal swelling, such as pelvic inflammatory disease patients will lead to pelvic area mucous membrane congestion, causing abdominal discomfort symptoms. 4. Breast disease: If the patient has mastitis, breast hyperplasia and other diseases, there will be breast pain, lumps in the breast and other symptoms. Since a variety of factors can cause this symptom, it is recommended that the patient consult a doctor in time to do a systematic examination and make a clear diagnosis.