Bloating. It’s one thing to feel overly full after a large celebratory meal, but unfortunately, for many patients in cancer treatment, bloating doesn’t come with a holiday, but instead is an unpleasant side effect of cancer therapy. Bloating can be caused by slowed movement of food through the G.I. (gastrointestinal tract or digestive tract) tract due to gastric surgery, chemotherapy (also called chemo belly), radiation therapy or medications. Whatever the cause, the discomfort is universally not welcome.