Ovarian pain can be constant or acute sometimes, it comes and goes with the menstrual cycle. It can sometimes get worse with certain activities like sport, sexual intercourse, or peeing. Whatever the type of pain you are having, go and see a doctor if you are worried. This list is meant to serve as a guide, not a diagnostic tool.
Causes of pain in the ovaryOvulation pain. This is experienced by 20 percent of ovulating women, and is usually harmless. An ovarian cyst can cause pain, heavy and prolonged periods, bloating, and feeling full after eating a small meal. An ectopic pregnancy is likely to lead to extreme pain, most often originating from the fallopian tubes in case of a tubal pregnancy. This may, however, be confused with ovarian pain. Ectopic pregnancies can also cause vaginal bleeding. Endometriosis can cause pain, as well as a variety of other symptoms. More about this in what are the symptoms of endometriosis? Ovarian tumors can cause symptoms like a changed in bowel movements (diarrhea or constipation), bloating, loss of appetite and rapid weight gain or loss in addition to pain in the affected ovary. Pelvic Inflammatory Disease is an infection that can strike the ovaries as well as the uterus and fallopian tubes. It is usually caused by chlamydia.
Unless you are sure that your pain is caused by ovulation (in which case you'll have pain in the left ovary one month, and then in the right ovary the following), please go and see a doctor.