<s>[INST] hI, I am not married. my menstruation is regular. Once a month i have a lower abdomen pain on my left side and lower lower i also have a sever pain which i can bearly walk, i have to wait for the pain to subside which takes a few hours. is this something i should have checked? [/INST] Hello, The most probable reasons for pain in the left lower abdomen, which takes a few hours to settle and occur every month, in spite of regular menses, and you are unmarried are:-Twisted ovarian cyst.-Mittelschmerz syn Chat Doctor. -Colitis.-Sigmoid volumes and so on. Yes, it is something you checked about it. The best investigations would better be done when you have pain:-Ultrasonography-X-ray of the abdomen in standing position. Physical examination by a general surgeon. It will get you diagnosed, and treatment would be an easy task. Hope I have answered your query. Let me know if I can assist you further.  </s>