Have you noticed if bad posture can cause a pinching pain that comes and goes in the lower right abdomen? (I don't have an appendix, so it's not that.) Oh, and gas too. I tend to forget my posture after several hours at the computer, and sit with legs crossed, twisted to the right. The muscles on the right side of my spine are very tight, and possibly pulling my hip out of alignment as well. The pain happens throughout the day, off and on.