Cancer is a disease that occurs when malignant cells grow in the body. These cells can form almost anywhere, including the brain, lungs, pancreas, and more. Cancerous cells cluster together to form a mass called a tumor and can spread throughout the body to other, more distant areas.

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What Is Cancer?

Cancer can cause almost any type of symptom—everything from fatigue to pain to shortness of breath and more.

Cervical Cancer Rates Have Dropped—but Rates of This HPV-Related Cancer Are on the Rise

We're doing a good job preventing some types of sexually transmitted cancers, suggests a new CDC report, but there's room for improvement.

Doctors Dismissed the Lump on My Neck as a ‘Swollen Lymph Node’ for 5 Years—but It Turned Out to Be Cancer

During her first year of medical school, Diana Cejas went to the doctor because she found a lump on her neck. She was told it was “nothing to worry about” and that antibiotics would take care of it.

Following These 10 Steps Can Slash Your Cancer Risk by 40%

A new report shows that obesity is linked to 12 different types of cancer—and by maintaining a healthy weight and healthy habits, you can dramatically reduce your risk.

More on Cancer

A Doctor Told This New Mom to Lose Weight—but It Turned Out She Had Cancer

Jen Curran, 38, isn't the first woman to bring troubling symptoms to a doctor's attention and have them wrongly dismissed as weight-related. Here's how to help make sure this doesn't happen to you.

Fox Anchor Is Diagnosed with Colon Cancer After Her Screening Was Canceled 3 Times Due to Pandemic

Lindy Thackston was finally diagnosed with stage 3 colorectal cancer after three months, and “was just wondering how much time” she had left with her 4-year-old son.