Eating lettuce diarrhea may be due to dietary impurity, indigestion, digestive diseases. 1. Dietary impurity: lettuce in the washing time is not clean, resulting in the leaves of the bacteria are not completely removed, eat into the body will lead to acute gastroenteritis, intestinal infections can appear diarrhea. 2. indigestion: may be due to a one-time intake of too much lettuce, resulting in increased burden on the gastrointestinal tract, indigestion and diarrhea triggered by the situation. 3. Digestive diseases: If the patient originally has digestive diseases, such as chronic gastritis, gastric ulcer, etc., when eating lettuce and other foods, stimulate the mucous membrane of the digestive tract, the primary disease attack, gastrointestinal dysfunction, such as abdominal pain, diarrhea and other conditions. At this time should actively treat the primary disease. It is recommended to eat lettuce before cleaning, and not to eat too much lettuce at a time, in addition to digestive diseases patients try to eat as little as possible cold vegetables, so as not to aggravate the primary disease, if diarrhea, abdominal pain and other conditions, need to seek medical treatment.