Diarrhea after eating potatoes may be related to spoiled potatoes, allergy to potatoes, and combined gastrointestinal diseases, as follows. 1. Spoiled potatoes: spoiled potatoes stimulate the gastrointestinal tract due to toxins, affecting gastrointestinal tract function, resulting in nausea, vomiting, abdominal pain, diarrhea and other symptoms. 2. Allergy: some people may be allergic to potatoes, so after eating potatoes, skin rashes, itchy skin, diarrhea, breathing difficulties and other symptoms. At this time, we must consult a doctor as soon as possible, for anti-allergy treatment. Commonly used anti-allergy drugs are Benadryl and so on. 3. Combined with gastrointestinal diseases: If the patient has chronic gastritis, inflammatory bowel disease, dyspepsia and other gastrointestinal diseases, eating too much potato may appear diarrhea, may be accompanied by abdominal pain, vomiting and other symptoms. It can be treated with acid suppression (omeprazole, etc.) and gastrointestinal mucosa protection (teprenone capsules, etc.) as prescribed by the doctor. There are many causes of diarrhea after eating potatoes, it is recommended to consult a doctor in a timely manner, after a clear diagnosis to carry out targeted treatment, so as not to delay the condition.