Diarrhea after drinking Si-Yi San may be caused by poor diet, incorrect medication, and so on. Consult your doctor for specific reasons. 1. Dietary disorders: If the patient consumes too much cold, oily, spicy and stimulating food, such as frozen drinks, fatty meat, chili peppers, etc., diarrhea may occur when using SiHuiSan. 2. Incorrect medication: Sihui San, composed of Chai Hu, Citrus aurantium dulcis (bran-fried), white peony and licorice. It is used for febrile syncope without warmth in the hands and feet, epigastric (abdominal) dystocia (pain in the area of the coats of arms and ribs), and diarrhea with heaviness underneath. If the medicine is not correct, diarrhea may also be manifested. The adverse reactions and contraindications of Si Yi San are not known at this time. If the manifestation of diarrhea persists without relief, the medicine should be discontinued and hospitalized.