What is the cause of dull pain in the left side of the abdomen of a 30-year-old woman

30-year-old woman abdominal pain on the left side, the main reason for gynecological diseases. Such as uterine appendicitis, pelvic inflammatory disease, ovarian cysts, etc. But if suffering from intestinal diseases, such as poor diet, so that intestinal bacterial infection, caused by enteritis, will also cause abdominal pain on one side.