Definition of "Irritation" :

noun: the act of troubling or annoying someone

noun: unfriendly behavior that causes anger or resentment

noun: an uncomfortable feeling of mental painfulness or distress

noun: a sudden outburst of anger

noun: the neural or electrical arousal of an organ or muscle or gland

noun: the psychological state of being irritated or annoyed

noun: (pathology) abnormal sensitivity to stimulation

"Any food produced irritation of the stomach."