Bad stomach and intestines during menstruation may be due to symptoms caused by excessive secretion of gastric acid and indigestion, which can be relieved by changing diet and taking medication. 1. Excessive secretion of gastric acid: If the patient eats spicy and stimulating food during menstruation, such as chili pepper, barbecue and other food, it may cause excessive secretion of gastric acid, and calcium carbonate glycine capsule can be used to inhibit the secretion of gastric acid. 2. Indigestion: it may be due to the postpartum maternal exercise will be less, resulting in slow peristalsis, and thus indigestion, you can use lactobacillus tablets and other drugs to treat, appropriate exercise. Mothers should eat a light diet, rich in nutrients, to provide nutrients for the body and the fetus, and seek medical attention when abnormalities occur.