Chemotherapy can cause bowel problems, either diarrhea or constipation. Some medications can be recommended to regulate these problems. Be sure that you are taking all medications as prescribed. Drink plenty of fluid to replace what you lose with diarrhea, and try to avoid alcohol, caffeine, milk products, high-fat foods, and high-fiber foods. When you have diarrhea, they may make you unwell.
Let the cancer care team seek immediate medical attention and advice. Consider eating whole foods (cereals, raw vegetables, and fruits) and consuming plenty of liquid if you are constipated. Smooth exercise, such as short walks, may help improve constipation.