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.
Former 'Biggest Loser' Star Daniel Wright Died of Acute Lymphocytic Leukemia—Here's What That Means
This form of leukemia is estimated to strike almost 6,000 people this year.
Abby Lee Miller Was Diagnosed With Non-Hodgkin Lymphoma. Here's What That Means
This type of cancer starts in white blood cells and is most common in late middle age.
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.
Sleep Apnea and Cancer: Here's What We Know About How They're Related
A scary new report links this common sleep problem to cancer, especially in women—but how worried should you be?
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

This Woman's Tiny Bruise Turned Out to Be a Rare Form of Skin Cancer
The blemish on her shoulder was actually a Bednar tumor, a type of soft-tissue sarcoma.
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.
Tennis Star Chris Evert Reveals Stage 1C Ovarian Cancer Diagnosis—Here's What That Means

Evert's cancer was found following a preventive hysterectomy. Her sister, Jeanne Evert Dubin, died of the same disease in February 2020.