From how long you have these symptoms?
What is the exact site,I mean left/right or middle of lower abdomen?
Also please elaborate your symptoms?
The complaints you have described can be due to various causes like:diverticulitis, colonic infection or inflammation of the colon,mal absorption syndrome,(MAS),irritable bowel syndrome(IBS).Certain medications can also cause this. You need stool test which is the basic test to detect any abnormality of GIT.You need:ultrasound of lower abdomen,colonoscopy,endoscopy,gastroscopy or EGD,stool examination & culture,x-rays of abdomen,barium meal studies & barium follow through tests are required.
The exact diagnosis can only be made after physical examination & tests.So I advice you to make an appointment with your doctor.
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