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.
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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.
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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.
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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?
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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.
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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.
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One in 10 People With Any of These 3 Serious Conditions Will Be Misdiagnosed, a New Study Says—Here's Why

It's time to talk about why medical misdiagnosis of the so-called Big Three conditions are scarily high.