Nope, sorry, I don't know the reason, but sometimes I get one too towards the end of a cycle. I assumed it was Tobi I swallowed during my treatment irritating my stomach. I also was recently treated for H Pylori (can cause stomach ulcers) because of stomach aches (but I had no ulcers), but I don't know if that had anything to do with it or not. Funny you should mention this now, as I just stopped my Tobi early yesterday to see if it was the Tobi this time that was bothering my tummy, or something else... I'd also be interested in any other replies... <img src="">