Cancer chemotherapy. Male patient receiving anticancer drugs from an intravenous drip bag. This continuously supplies the patient with a controlled amount of drugs that target cancer cells. The drugs target all rapidly dividing cells, which causes them to have a range of side effects, including hair loss. Cancer is a disease caused by the uncontrolled replication of abnormal cells, which can invade and destroy healthy tissue. Special care is given to management and prevention of acute side effects of therapies, in particular allergic reactions, emesis, diarrhea, and extravasation of cytotoxic drugs.