Is it normal for nausea to accompany IBS? When my symptoms really act up I get gas and bloating, constipation, horrible gut cramps, and sometimes overwhelming nausea. I was just wondering if this is a normal side effect? Or is it something I should try to get checked out at the doctor's office. (And just so you know, I am NOT pregnant. I had a doctor insist that was the reason I was so sick when I knew for a fact it wasn't.)