Bad stomach (diarrhea) is mainly associated with indigestion, food allergies, acute enteritis and other causes, different causes of different treatments, it is recommended that further examination to clarify the causes, and follow the doctor’s instructions for targeted treatment. 1. Indigestion: Bad stomach caused by indigestion can be treated with Ranitidine Hydrochloride Capsules, Omeprazole Magnesium Enteric Tablets, Pantoprazole Sodium Enteric Tablets and so on according to the doctor’s prescription, which can effectively treat indigestion and relieve the symptoms. 2. Food allergy: due to the patient eating allergic food, the body produces allergic reaction, easy to bad stomach, can be treated by drugs, such as amoxicillin capsules, loratadine tablets, methylprednisolone tablets and so on, to alleviate the symptoms. 3. Acute enteritis: caused by bacterial or viral infection leads to inflammation of the intestinal tract, usually manifested as diarrhea, nausea, vomiting, and so on, and severe cases can also lead to fever, shock and other symptoms, can be treated through medication, such as Bacillus licheniformis live bacterial capsules, amoxicillin capsules, azithromycin tablets and other anti-inflammatory and antibacterial treatment, to alleviate the pain in the abdomen. Long-term persistent diarrhea will cause the patient’s lethargy and weakness and low immunity, it is recommended to go to the hospital as soon as possible, and ensure a healthy diet in daily life, eat less cold, spicy and greasy food, which can improve the situation of bad stomach.