Any form of cancer can cause problems with diarrhea, vomiting, constipation and an upset stomach, firstly, because cancer interferes with appetite and food absorption, causing malnutrition. Chemotherapy and other anti-cancer medication can also reduce appetite. The stress cancer provokes in many individuals can also trigger difficulties related to the digestive system. Some patients develop food intolerances and may begin to avoid certain foods, trying to stave off the side effects.

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