To learn more about cancer, check out these videos—developed and reviewed by the health experts at Healthology. Note: these videos will open in their own player, off the ACS Web site. Healthology is a commercial site, and ACS is not responsible for its content or advertising.

Cancer 101
What causes cancer and why is it so hard to treat? Leading experts provide an overview of cancer, from what goes wrong in a cell's genetic instructions to the latest treatment strategies. Duration 04:56.

Gut-friendly Nutrition: Eating Right for GI Health
Cancers of the GI system are among the most preventable. Learn how simple changes in diet can help keep your digestive system healthy and possibly prevent colon cancer. Duration: 06:03.

Cancer and Cancer Treatment: Can it Affect Sleep?
People with cancer have a lot on their minds, which is why they may have trouble sleeping. But some cancer treatments can also upset sleep patterns. Learn what you can do to get a good night's rest. Duration: 05:21.

The Stress of Cancer: When to Seek Help
Cancer is an upsetting experience. Worries about treatments and the future make it hard to function. Find what to do if the stress is too much to handle. Duration: 05:19.