I had a backed-up problem recently. Then I ate tuna casserole, and an hour after eating, I sat and crap flew out of my backside fast-paced like. My question being: is constipation then diarrhea -- without laxatives -- normal? Or did the food I ate evacuate my bowels?

Dear Shyman,

While it's tempting to blame the tuna casserole, it probably was not the immediate culprit. It usually takes food at least several hours to a day to make the journey to freedom.

There are lots of things that could be going on. IBS (Irritable Bowel Syndrome) can sometimes cause symptoms like alternating diarrhea and constipation. Could be something bad you ate during the day prior to the diarrhea.

If this happens infrequently, I'd put it down to one of those poop mysteries that will likely never be solved. If it seems to happen on a regular basis, go to the doctor and let him figure it out.

But don't be so quick to blame tuna. I love tuna. My tuna casserole would NEVER give you the runs.

Good luck!

Please be advised that I am only a Poonurse. I am NOT a medical doctor. Any advice I give should be taken moderate skepticism. Please consult a REAL medical doctor if you feel you have a serious medical condition.

-- Poonurse [1]

Poonurse is an RN with 25 years experience in labor and delivery. Her qualifications include seeing a lot of poop, and owning a computer. Also, she works in Michigan, which she calls the asshole of the universe, so that's another bit of credibility. Got a question [2] for her?