If the diarrhea caused by chemotherapy is not very serious, you can eat some easily digestible food, such as millet porridge, rotten noodles, etc., and eat less food containing more protein and fat, such as meat, because eating these foods is certainly not absorbed, and now it will aggravate the damage to the intestinal mucosa, leading to more serious diarrhea. You can also eat some drugs that protect the intestinal mucosa and stop bleeding. If the diarrhea is very serious and even causes dehydration, it is generally necessary to prohibit diet, and at the same time, you need to carry out intravenous nutritional rehydration, and you can also infuse some drugs that inhibit the secretion of intestinal fluids, and at the same time take oral antidiarrheal drugs, so that after the function of the intestine is restored, the diarrhea disappears and then consider eating something.