Abdominal pain can occur due to many conditions - including acute gastritis, gall stones, acute colitis, enteritis, musculoskeletal pain, etc.
Pain that originates due to renal issues (Stones, infection) is usually episodic, spasmodic or colicky in nature, originating in the flank and radiating to the lower belly, inner thigh. It is associated with other symptoms like nausea, vomiting and systemic features due to any infection.
The exact cause of your symptoms need to be ruled out with a ultrasound or a CT scan of the abdomen. The results of your Urine analysis, might also give a clue to the probable cause.
For proper help and advice, you may consult your doctors who can advice you accordingly.
I have the same issues. I know my stomach pains (contraction like) are coming because I get pain where my left kidney is and my stomach (right under the middle of my ribs) swells. I have had a colonoscopy and endoscopy and nothing turned up. They looked for kidney stones and checked my urine and everything was negative. My primary care physician thought it was crones disease but that was ruled out too. The gastronologist(?) chalked it up to IBS. Only thing that helps is vicoden. My symptoms evolve...sometimes I get the swelling and pain in my stomach with burning and no back pain. Another symptom I recently developed is that I'll feel like I'm starving then the swelling and stomach pain is back. Sometimes I have an urgency to go number two and other times I don't. This is not lower abdomen pain...wish there was a definitive answer, but apparently its just IBS.
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