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Parenteral nutrition, also called IV nutrition or hyperalimentation, is a way to provide nutrients directly into the bloodstream through a thin tube called a catheter placed into a vein. This method bypasses the stomach and intestines, delivering proteins, carbohydrates, fats, vitamins, and minerals straight into the blood. It is used when a person cannot eat or digest food normally, either because of illness, surgery, or side effects from treatments like chemotherapy.
Cancer and its treatments can cause side effects that make eating difficult or unsafe. These include nausea, vomiting, mouth sores, changes in taste, trouble swallowing, or digestive problems. Some cancers affect the digestive organs directly, making it hard to absorb nutrients. When eating by mouth or using feeding tubes is not enough or not possible, parenteral nutrition helps prevent malnutrition, supports healing, and keeps the body strong during treatment.
If your care team recommends parenteral nutrition, they will explain how the catheter is placed—often into a large vein in the chest or arm—and how the nutrition is given, usually through a pump. You might hear about partial parenteral nutrition (PPN), which supplements some oral intake, or total parenteral nutrition (TPN), which provides all nutrition when eating is not possible. The team will monitor your nutrition, lab tests, and overall health to adjust the plan and watch for side effects.
Parenteral nutrition may appear in your medical records, treatment plans, hospital notes, or discussions about managing side effects of cancer therapy. It is often mentioned alongside enteral nutrition, which uses the digestive system through feeding tubes. Understanding these terms can help you follow your care plan and ask informed questions.
Needing parenteral nutrition does not mean the cancer is untreatable or that you will never eat again. It is a supportive measure to maintain nutrition when eating is difficult or unsafe. It is part of a larger plan to manage nutrition during cancer treatment and recovery.
You might want to ask how long parenteral nutrition will be needed, what the catheter placement involves, what side effects to watch for, and how your nutrition will be monitored. Also, ask how parenteral nutrition fits into your overall treatment plan and if a registered dietitian will help tailor your nutrition support.
Reading about parenteral nutrition alone can be confusing. It is best understood as one part of managing nutrition when eating is difficult due to cancer or its treatment. It often works alongside other nutrition support methods and medical care to help you stay as strong and healthy as possible.
This information is for education and does not replace personalized medical advice. Decisions about nutrition support depend on individual health needs and should be made with your care team. If you or a loved one faces nutrition challenges during cancer treatment, talking with your doctor or a registered dietitian can help you understand if parenteral nutrition is right for you and what to expect.
Public source information used for this glossary entry includes: