Side Ache Why Do I Get A Side Ache After Sitting For A Long Period Of Time?

Why do I get a side ache after sitting for a long period of time? - side ache

Normally I have a pain in the side by side in the bottom right, above the waist, after long periods of time. I am beginning to learn, after her work on my desk. My stomach is not complete and are empty, and help the lumbar support on my back. Ideas?