Diarrhea after eating may be caused by food factors, irritable bowel syndrome, gastrointestinal dysfunction, chronic enteritis, intestinal tuberculosis, and requires prompt consultation with the gastroenterology department to clarify the cause and provide symptomatic treatment. 1, food factors: such as eating cold, spicy and irritating food may cause gastrointestinal dysfunction, which in turn leads to diarrhea after meals. In addition, unclean diet may also lead to the occurrence of postprandial diarrhea. It is recommended to wash hands before meals, avoid eating expired or overnight food, as well as cold, spicy and irritating food; 2. Irritable bowel syndrome: Most of them are caused by cold and flu or irregular diet, as well as frequent insomnia and anxiety, resulting in plant nervous dysfunction, which can manifest as diarrhea after eating. Under the guidance of a doctor, oral medication for nerve regulation, such as glutamine and vitamin B, keep a happy mood, avoid tension, and pay attention to diet regulation. 3, gastrointestinal dysfunction: due to weakness of the spleen and stomach, indigestion leads to gastrointestinal dysfunction, manifested as diarrhea after eating. Treatment should pay attention to a light diet and take oral digestive drugs as prescribed by the doctor, such as multi-enzyme tablets and hen’s gold tablets, etc.; 4, chronic enteritis: food stimulation of the gastrointestinal tract after eating, resulting in increased peristalsis of the colon, which in turn leads to diarrhea, and can be treated with oral salbutamol under the guidance of a doctor if necessary; 5, intestinal tuberculosis: accompanied by pain in the right lower abdomen, and often triggered by eating. The diarrhea is often accompanied by abdominal pain, semi-formed or watery stools, which can be several or dozens of times a day, or pus stools in severe cases. Intestinal tuberculosis requires anti-tuberculosis treatment, i.e., early, combined, appropriate and full doses of drugs. Common drugs include isoniazid, rifampin, ethambutol, pyrazinamide, and streptomycin. Surgical treatment is required for intestinal obstruction with strangulated bowel obstruction and those that have failed to respond to conservative treatment. In addition, patients with active intestinal tuberculosis are advised to rest in bed, reduce caloric consumption, and avoid exercise and heavy physical labor. Attention should be paid to improving nutrition, increasing the body’s resistance, quitting smoking and alcohol, and avoiding excessive emotional stress and anxiety.