I had my left kidney removed 9 months ago. Over the past 3 months every so often ( 1-2 times a month), when I go to stand up I get a severe pain in my lower abdomen and find it difficult to stand up straight. If I bend back down for about 30 seconds or so the pain will go away.  If I continue to try to stand up in spite of the pain it gets worse and idea?
Hi. The probable cause of such a pain which increases on standing up and get relieved by bending back can be due to muscle spasm, nerve entrapment in the scar tissue, sprain of the abdominal muscles. Take a course pf Ibuprofen for a 5-day course and see the response. Avoid strenuous activities till you get a complete relief and a proper diagnosis. Consult a General Surgeon for one physical examination.