<s>[INST] My lower left abdomin is painful when I push on it.  I have noticed that going number 2 has gone from being normal to almost nothing...my lower back feels stiff and hurts at times...it's only been 3 days but it doesn't seem right...should I be worried? [/INST] i. Yes you should be worried. Consult a Gastro. I would advise you to take an antibiotic and Metronidazole for full 5 days and see the results. This is called colitis = infection and inflammation of a large bowel. Take plenty of oral fluids </s>