Every time you eat noodles diarrhea can be caused by starch intolerance, indigestion, chronic gastroenteritis and other reasons. 1. Starch intolerance: Eating noodles and having diarrhea may be a phenomenon of starch intolerance or allergy to the starch in noodles which stimulates the intestinal tract not to be able to absorb it well, leading to diarrhea. 2. Indigestion: If the noodles are not cooked or too many noodles are eaten, it may lead to indigestion in the gastrointestinal tract. Once indigestion occurs, it may be accompanied by bloating, abdominal pain, diarrhea and other symptoms. 3. Chronic gastroenteritis: If the patient suffers from chronic gastroenteritis, diarrhea may occur after eating noodles every time, which may also be accompanied by diarrhea, abdominal pain, nausea, vomiting and other symptoms. Every time you eat noodles diarrhea patients need to go to the regular hospital to do routine blood tests and routine stool examination, clear cause of the symptomatic treatment, usually pay attention to diet and hygiene.