Feeling lots of pain in left hand side of lower back and lower belly and tightness?

Colon? kidney?: Diverticulitis commonly causes left lower abdominal pain, sometimes exacerbated/relieved by a bowel movement. Inflammatory colitises can cause symptoms. Constipation. Kidney issuesyou should see a doctor if it has lasted longer than a few days or if it is severe and limiting your daily activities.. There are other causes as well and you may require a ct scan or colonoscopy to help sort them out.