Eating instant noodles and diarrhea may be due to the irritation of instant noodles, the quality of instant noodles and suffering from digestive diseases. 1. Stimulation of instant noodles: instant noodles are usually deep-fried, and the seasoning packet usually contains many additives, so instant noodles are irritating. People with poor gastrointestinal function can easily get diarrhea if they eat too much instant noodles. 2. Instant noodles quality problems: If the instant noodles are not produced by the regular manufacturers, the pasta or seasoning packet hygiene is not up to standard, such as dust, eggs or preservatives, eaten into the stomach, these dust, eggs or preservatives may stimulate rapid intestinal peristalsis, thus causing diarrhea. 3. Suffering from digestive diseases: Patients suffering from digestive diseases like peptic ulcer, chronic enteritis, etc., the gastrointestinal tract itself becomes sensitive under the stimulation of gastric acid, Helicobacter pylori, inflammatory factors and other factors. Eating greasy instant noodles exacerbates the irritation and may lead to diarrhea. Patients who always have diarrhea from eating instant noodles, but do not have diarrhea from eating other foods, need to check whether there is a problem with the box of instant noodles they bought, and should also go to the hospital in time to prevent delays.