The pathogenesis of RLP is varied. Although very common during pregnancy, non-gestating women can also experience RLP. The most common causes of RLP are as follows: *RLP may be caused by a spasm or cramp when the<unk>  contracts involuntarily. The<unk>  pulls on nerve fibers and sensitive structures of the female reproductive system. Since the uterus tends to be oriented towards the right side of the body, the pain is also often felt on the right side. This leads to frequent confusion with appendicitis. *During pregnancy, the uterus expands to accommodate the growing fetus. This increase in size and weight of the uterus puts stress on the<unk>  that holds it, causing it to stretch. During physical exertion or sudden movements, the<unk>  is overly stretched, causing pain. *Varicosities, e.g. enlargement of the blood vessels of the<unk><unk>  can occur during pregnancy, causing pain and swelling. The varicocoele starts at the veins draining the<unk><unk>  and the inguinal canal and is associated with engorgement of the veins of the ovaries and the pelvis during pregnancy. *Endometriosis that infiltrates or borders the uterine<unk><unk>  can cause RLP in fertile, non-gestating women. *Other pathologies that involve the uterine<unk><unk>  can cause RLP.
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