The symptoms you reported (lower back pain, lower left abdominal pain, and left abdominal swelling) are not specific enough for a definitive diagnosis to be given. Whether you have any bowel movement problems or changes in the stool might have been helpful.
It seems likely that the location of the pain and the swelling might be related to bowel problems. Gastrointestinal bacterial infection might be easily detected with a stool culture. Visualization methods (X-ray and/or colonoscopy performed by gastroenterologist) might easily detect lesions or growths in the large intestine. A “Blood in the stool” test is a non-invasive method for early detection of lesions or growth formations in the intestines.
In the end, if nothing is found, the reason for the pain and the swelling might be due to gasses caused by constipation. Dietary changes that provide food rich in fibers might increase the volume of the stool, thus enabling easier and more frequent defecation.
The definitive diagnosis would be most easily given by a gastroenterologist.
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