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What is a tumor?

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A tumor is a mass of tissue that's formed by an accumulation of abnormal cells. Normally, the cells in your body age, die, and are replaced by new cells. With cancer and other tumors, something disrupts this cycle. Tumor cells grow, even though the body does not need them, and unlike normal old cells, they don't die. As this process goes on, the tumor continues to grow as more and more cells are added to the mass.

From: Brain Tumors in Adults WebMD Medical Reference

SOURCES:

MedlinePlus Encyclopedia: "Brain tumor - primary - adults."

National Cancer Institute: "National Cancer Institute Brain Tumor Study in Adults: Fact Sheet."

National Cancer Institute: "What You Need to Know About Brain Tumors."

National Cancer Institute: "General Information About Brain Tumors."

American Brain Tumor Association: "Symptoms."

National Cancer Institute: "Adult Brain Tumors Treatment."

Reviewed by Melinda Ratini on March 7, 2017

WAS THIS ANSWER HELPFUL

SOURCES:

MedlinePlus Encyclopedia: "Brain tumor - primary - adults."

National Cancer Institute: "National Cancer Institute Brain Tumor Study in Adults: Fact Sheet."

National Cancer Institute: "What You Need to Know About Brain Tumors."

National Cancer Institute: "General Information About Brain Tumors."

American Brain Tumor Association: "Symptoms."

National Cancer Institute: "Adult Brain Tumors Treatment."

Reviewed by Melinda Ratini on March 7, 2017

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

    This tool does not provide medical advice. See additional information.

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