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Fibroids and ovarian cysts or tumors.
dull pain, bloating, and so forth.
If the symptom is due to fibroids, you should have heavy periods. If not, it could be due to an ovarian cyst or tumor. But the discomfort right under the right rib doesn't seem to be due to it. It could be due to a inflamed gall bladder. You should see your doctor to have ultrasound.