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 - 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.

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.

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

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, causes, treatments, and types - Medical News Today
In this article, we examine types of cancer, how the disease develops, and how doctors may treat it. We also explore different types of cancer and disease outlook.

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.

Early Signs and Symptoms of Cancer to Watch For
Melanoma, the most dangerous form of skin cancer, may begin with a mole that changes in size, shape, or color. But beyond melanoma, many other cancers cause skin-related symptoms: yellowing (jaundice) in liver cancer, darkening (hyperpigmentation) in adrenal cancers, or itching and rashes in lymphoma.