Question: can seasonal allergies cause diarrhea?
Answer: Diarrhea and Allergies It's not a common symptom, but some people who experience the red eyes, runny nose, sneezing, and wheezing of allergies in the spring may also have a case of diarrhea on top of it all. “Diarrhea as the sole symptom of seasonal allergies would be uncommon,” said Kussin.