Immunotherapy does not attack cancer cells directly, it trains the immune system so it can recognise and target them. This approach is more selective than chemotherapy which is why many patients experience fewer side effects. Chemo side effects are more common and usually what people expect, like hair loss or nausea. Although immunotherapy side effects are less common, when they happen, they can sometimes be more serious. Most people do well on immunotherapy. Many have no side effects, or they are mild and treatable when caught early. But when they do happen, the time to react and treat is crucial.
If the immune system gets too active from immunotherapy, it can attack healthy parts of the body by mistake. These reactions can happen anywhere. They can affect your skin, which might cause a rash. They can target your lungs, which could cause a cough. They can also affect your liver, kidneys, or intestines.
Anyone considering immunotherapy should speak with a qualified clinic or specialist. The right team will explain what to expect, how monitoring works and what symptoms to expect and report.