Cancer treatment can cause side-effects and sometimes these can be more difficult to manage than the illness itself. Some of these are common and experienced by many, some are much rarer and occur in very few patients. This booklet is designed to provide you with information about the common side-effects you may experience, what to expect and how they may be managed. It covers the following side effects: increased chance of infection; fatigue; hair loss; anaemia; gastrointestinal side-effects (nausea and vomiting, appetitie changes, constipation, diarrhoea); mouth changes; cognitive effects; pain and tingling; fertility; cardiac and lung toxicity; and secondary cancer risk. It also includes a glossary and details of useful contacts and further support.