Nausea and Vomiting

Approved by the Cancer.Net Editorial Board, 04/2014

Nausea and vomiting are common side effects of many cancer treatments. Nausea is feeling the urge to vomit, or throw up. Vomiting may happen in expectation of treatment, within 24 hours after treatment, or two or more days after treatment.

Causes of nausea and vomiting

For people with cancer, nausea and vomiting may be caused by the following:

People who are more likely to have nausea and vomiting from chemotherapy include the following:

  • People who have previously vomited after cancer treatment
  • People who often have motion sickness
  • People who are anxious before cancer treatment
  • People younger than 50, especially women

Mild nausea and vomiting can be quite uncomfortable, but it usually does not cause serious problems. Severe vomiting, such as vomiting a lot and often, can cause dehydration, electrolyte imbalance, weight loss, and depression. In addition, severe vomiting may lead some patients to stop cancer treatment.

Managing nausea and preventing vomiting

Relieving side effects, also called symptom management, palliative care, or supportive care, is an important part of cancer care and treatment. Learn more about ASCO's guidelines on preventing vomiting from chemotherapy or radiation therapy with medications.

Many people find that behavioral treatments can help control nausea and vomiting. Methods such as distraction, relaxation, and positive imagery can help change the expectation and fear of nausea and vomiting. Talk with your health care team about any symptoms you experience, including any new symptoms or a change in symptoms. In some situations, your doctor may be able to recommend another treatment plan that is less likely to cause vomiting.

More Information

ASCO Answers Fact Sheet: Nausea and Vomiting (PDF)

Nutrition Recommendations During and After Treatment

Managing the Side Effects of Chemotherapy, with Lynn Schuchter, MD

About Complementary and Alternative Medicine

Additional Resource

National Cancer Institute: Nausea and Vomiting