Eating lettuce diarrhea can be caused by lettuce not washed, gastric mucous membrane irritation, gastrointestinal diseases and so on. 1. Lettuce is not washed: If you do not wash the lettuce before eating it, there may be bacteria, parasites or residual pesticides on the lettuce, which can easily cause gastrointestinal disorders after entering the gastrointestinal tract, leading to diarrhea. 2. Stimulation of the gastric mucosa: lettuce uncooked will be cooler, causing some stimulation of the gastric mucosa, leading to diarrhea. 3. Gastrointestinal diseases: such as acute gastroenteritis, usually caused by unhygienic diet, often causing nausea, vomiting, diarrhea and so on. Eat lettuce diarrhea patients should go to the hospital in time, after a clear diagnosis with the doctor’s treatment.