NCI is the nation’s trusted source for cancer information. We are here for you with information about causes and risk factors, symptoms, how cancer is diagnosed, and treatment options. Support for the best science underpins everything NCI does.

Explanations about what cancer is, how cancer cells differ from normal cells, and genetic changes that cause cancer to grow and spread.

Learn about cancer at the American Cancer Society. Find information for specific cancer types: breast, colon, lung, prostate, skin, and more.

There are two main categories of cancer: Hematologic (blood) cancers are cancers of the blood cells, including leukemia, lymphoma, and multiple myeloma. Solid tumor cancers are cancers of any of the other body organs or tissues. The most common solid tumors are breast, prostate, lung, and colorectal cancers.

Cancer is when abnormal cells grow out of control and spread to other areas of your body. It can start almost anywhere, including skin, organs, bones and blood.

Cancer is more than just one disease. There are many types of cancer, and it can develop anywhere in the body. Learn more about what cancer is, how it starts, and why it can be hard to cure.

Jan 23, 2025 · Cancer is a disease characterized by the uncontrolled multiplication of abnormal cells in the body. There are numerous types of cancers, with certain types being major causes of sickness and death worldwide.

Learn about the factors that contribute to the unequal burden of cancer and which population groups are affected. This page is a gateway to basic information about how cancer develops, trends in cancer cases and deaths, and how cancer affects different populations.

Nov 19, 2024 · Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.

Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. [2] [7] These contrast with benign tumors, which do not spread. [7] Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss, and a change in bowel movements. [1]