I have an interesting observation and was wondering if anyone else has the same experiences. During high pollen season and allergy season my IBS goes wild. The extreme bloating and constipation seems to go hand in hand with my allergy symptoms and stuffy, achy sinus and sinus infections. One of my doctor consultants feels that it's due to infection that comes from the sinus and while rare is not unheard of. On days the pollen is low my symptoms are less...not gone but less.On the other hand I have another doctor who says that allergies that are air born can't cause these symptoms....so I asked her if the sever sinus drainage can contribute to this and her answer as no...maybe a little upset stomach but not these symptoms. I was wondering if anyone else has experiences like this.Thanks so much