Advice for Nausea and VomitingNausea and vomiting are side effects of certain anti-cancer treatments. They may also be due to the illness itself. Ill health, admission to hospital or regular visits for treatment may cause anxiety. This can also affect how much nausea you feel and how you cope with it.People react differently to treatment, such as radiotherapy and chemotherapy. Some have very few problems, but if nausea or vomiting does occur, it can be unpleasant. Advances in medicine are making these symptoms increasingly treatable. There are also other ways to reduce or prevent these side effects.