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.

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.

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: 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.

Cancer: Types, Causes, Treatment, and Prevention - Healthline
Cancer is a group of diseases that occur when abnormal cells divide rapidly and spread. Learn the types, causes, treatments, and prevention methods.

Cancer Resource Center - WebMD
Start here for information on common types of cancer, including breast, lung, colon, skin, prostate, and ovarian cancer. Get the facts on cancer symptoms, treatments, and recovery.

Cancer Overview - Harvard Health
What is it? Cancer is not a single disease. It's a group of diseases characterized by their ability to cause cells to change abnormally and grow out of control. Most types of cancer form a tumor, a lump or mass of cancerous cells.

HOME | Cancer Action
As a caring community of professionals and volunteers, we offer support, education, empowerment, hope and comfort to those touched by cancer. Cancer Action programs and services are free of charge.

Cancer Care | HCA Midwest Health
Oncology is the prevention, diagnosis and treatment of cancer. Oncologists at Sarah Cannon Cancer Network extensively train to provide treatment plans that may include a combination of chemotherapy, immunotherapy, radiation, medication or surgery.

Cancer - World Health Organization (WHO)
WHO fact sheet on cancer providing information on the health burden of different types of cancer, causes, risk factors, prevention, early diagnosis, treatment, palliative care, and WHO's work in this area.