My sister has been complaining about lower right abdominal pain for a while. She's had a CT and ultrasound, CT results showed a 12mm simple kidney cyst, as well as a mid uterus lesion (has menopause), ultrasound confirmed that there wasn't a lesion that was visible to the eye. She has occasional pain and tenderness on the lower right abdominal, about twice a week, been going on for about 6 months. What could be causing it?