Can allergic rhinitis cause irritable stomach? been sensing some "kicking" and sensitivtie in upper abdomen, after taking antihstaminic this improved.

Rarely: If there is profuse amount of post-nasal drip, then one may have an irritated stomach even though this would be a rare occurrence. Do realize that the older antihistamine (benadryl (diphenhydramine) etc) may slow down the stomach and gut motility and might have accounted for the improvement in symptoms. the presence of "kicking" bothers me and should be checked by a doctor.