Have rt lower abdomen pain has had appendix, gallbladder, part hysterectomy & back surgery an have small ovarian cyst. What could pain be?

Hard to say. There are many possibities and usually a detailed exam and appropriate studies can determine the cause. Among some of the possibilities include diverticulitis, scar tissue from your prior surgery, a hernia, an irritation from a nerve in your back above where you had your previous back surgery just to name a few. I would encourage you to be seen.