without a thorough examination it is really not possible to offer you a definitive patient-specific answer but sciatica would be one very possible cause. pressure on the sciatic nerve out of your lower spine causes pain to go down your leg. it starts in the buttocks area (an area called the sciatic notch). please see your medical provider so that you can be properly examined diagnosed and treated.
i have pain in my right butt cheek it affects my leg i have taken pain pills and muscle relaxers but it still hurts. cannot lay or sit on this side