Few people get through chemotherapy without a single transfusion. At first it can be alarming, you wonder whether you are doing that badly, but a transfusion is actually quite common in the course of treatment, closer to something planned. Knowing in advance why they happen so often, and what to watch for during one, makes it far easier on the nerves.
The reason is simple. Chemotherapy targets fast-growing cancer cells, but the bone marrow that makes your blood is affected along with them. Red blood cells that carry oxygen fall, bringing anemia, and platelets that stop bleeding run short. When red cells drop too far, breathlessness and dizziness make daily life hard; when platelets are low, small bruises or gum bleeding appear easily. A transfusion is what tops up the missing component.
A transfusion does not put in whole blood; only the component you need is selected. If anemia is severe you receive red cells, and if the bleeding risk is high you receive platelets separately. Usually one bag is given slowly over an hour or two, and for the first ten or so minutes after it starts, the nurse checks on you often, because any reaction tends to show up early.
It helps to know what those reactions are. The most common are a mild fever or chills and itching such as hives, and these often settle well with medication. But if, during or just after a transfusion, your fever shoots up suddenly, you feel short of breath or tight in the chest, or your back aches and your urine turns dark, say so on the spot. These are rare but signal a need for quick action. Do not tough it out; reporting even a small change is the safe thing.
Before it begins, take part in the identity check. Staff confirm twice that the name, blood type, and patient details on the blood bag match yours, and it is reassuring to think of yourself as checking alongside them. The temperature and blood pressure taken before and after serve as comparison points, so if you feel different from usual, mention it ahead of time.
Back home, watch how you feel for a few days. A transfusion may lift your energy briefly, but it does not mean the marrow has recovered, and your counts may fall again at the next test. If gum bleeding will not stop, or you have black stools, sudden bruising, or a lasting fever, do not wait for the next appointment, call. In ordinary times, avoid strenuous exercise and knocks, and brush gently with a soft toothbrush.
This article shares general medical information in plain language and does not replace individual diagnosis or treatment. Decisions about whether and when to transfuse, and about reactions, should be discussed with your own care team.