Can not pooping cause back or kidney pain?

Yes: Pressure on the ureters can cause back pressure against the kidney and cause pain similar to a kidney stone. Pressure on the spinal nerves can cause pain in the back as well. Try a fleets enema, hold for thirty minutes while lying on your left side to liquefy the hard impacted stool and help it to evacuate more easily. Repeat up to three times if needed. Do this the day after you fail a bm.

Not kidney: Pain is more likely related to bowel distention than obstruction of the kidneys/ureters. Pain can be experienced throughout abdomen and back. Can be constant or colicy(comes in waves). Agree with judicious use of laxatives.

Pain: Constipation can cause abdominal or back pain. You may take a fiber laxative like Metamucil and drink enough water daily so that your urine is mostly colorless. You may increase your intake of fiber foods: Consult this site for fiber foods. http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/high-fiber-foods/art-20050948