Cancer and nausea are associated in about fifty percent of people affected by cancer.[1] This may be as a result of the cancer itself, or as an effect of the treatment such as chemotherapy, radiation therapy, or other medication such as opiates used for pain relief. About 70 to 80% of people undergoing chemotherapy experience nausea or vomiting. Nausea and vomiting may also occur in people not receiving treatment, often as a result of the disease involving the gastrointestinal tract,[2] electrolyte imbalance, or as a result of anxiety.[3] Nausea and vomiting may be experienced as the most unpleasant side effects of cytotoxic drugs[4] and may result in patients delaying or refusing further radiotherapy[5] or chemotherapy.[6]