What Is Cancer? - NCI
Explanations about what cancer is, how cancer cells differ from normal cells, and genetic changes that cause cancer to grow and spread.

Cancer - Wikipedia
Cancer is a group of diseases involving uncontrolled cell growth typically resulting in tumors with the potential to invade or spread to other parts of the body. [2][8] These malignant tumors contrast with benign tumors, which do not spread. [8] . Over 100 types of cancers affect humans. [8][9]

What Is Cancer? Symptoms, Causes & Types - Cleveland Clinic
Having cancer is a life-changing event. Knowing what to expect — from diagnosis to recovery — can empower you and help you take control of your health. This is a general overview of what cancer is, what causes it, how healthcare providers treat it and how you can take care of yourself throughout your journey.

Cancer - Symptoms and causes - Mayo Clinic
Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.

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

Cancer | Definition, Causes, Types, & Treatment | Britannica
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.

A to Z List of Cancer Types - NCI
Alphabetical list of all cancers, with links to disease-specific and general information about treatment, coping, screening, prevention, clinical trials, and other topics.

Cancer: Symptoms, Causes, Treatment, Stages, Prevention
Read about cancer symptoms, causes, treatment, stages, prognosis, diagnosis, types, and prevention. Learn what cancer is and what causes it. Inform yourself about the role viruses play in contributing to cancer. Learn why cancer occurs and how cancer cells form.

15 Early Symptoms That Could Be a Sign of Cancer - Health
Early signs of cancer can include swelling in the neck and skin sores that will not heal. Other symptoms include unusual pain and ongoing itching.

End Cancer As We Know It | American Cancer Society
1 in 3 men and women will be diagnosed with cancer in their lifetime. If you’ve been recently diagnosed, or know someone who has, we’re here with answers, guidance, and support.