Delayed menstruation and right groin pain may not be directly related, but may also be considered related to pregnancy, adnexitis, salpingitis, polycystic ovary syndrome and so on. 1. Pregnancy: When the fertilized egg is developing, it is easy to cause some women to appear right groin swelling and pain phenomenon, and also initially think that it is a delay in menstruation, but in fact, after pregnancy, women began to stop menstruation. 2. Adnexitis: the disease can cause some patients to experience delayed menstruation, the right groin swelling and pain phenomenon. Adnexitis is related to pathogen infection, inflammation of neighboring organs, etc. Typical symptoms of patients include lower abdominal pain, increased vaginal discharge, lumbosacral pain and swelling. 3. Tubulitis: mainly related to pathogen infection, and menstrual intercourse, gynecological surgical operations are triggering factors. Typical symptoms include lower abdominal pain, irregular vaginal bleeding, abdominal distension, increased vaginal discharge, menstrual disorders, etc. It can also be manifested as delayed menstruation and swelling and pain in the right groin. 4. Polycystic Ovary Syndrome (PCOS): It may cause delayed menstruation and right-sided groin distension in some women. The cause of the disease is still unclear, and it is considered to be the result of a combination of genetic and environmental factors. The main manifestations of patients include acne, hirsutism, infertility and hair loss. There are many causes of delayed menstruation and right groin swelling and pain, such as cervical cancer, fallopian tube cancer, etc. It is recommended to consult a doctor in time in order to clarify its specific cause.