What Causes Right Abdominal Burning Pain?

I have had this condition for about a year and a half now. It s a dull, gnawing and sometimes burning pain in my lower right side abdomen. I have had blood/urine analysis, an ultrasound and a colonoscopy and nothing. It seems to appear without cause, but now it is more prominent when I drink warm liquids. Friends say it might be linked to perimenopause and the ovaries shrinking . My mother had cancer of the cecum so obviously I am concerned about that too.