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With a world of knowledge, it’s amazing how easy it is to be misinformed if you research cancer treatment online. When in doubt, stick to a site ending in .gov or .org, though there are good exceptions. These sites were recommended by oncologists, nurses, and patients.

• Cancer.gov

  This National Cancer Institute site includes an extensive section on clinical trials plus a database with more than 7,300 terms related to cancer and medicine.

• Cancer.net

  With physician-approved information from the American Society of Clinical Oncology, this site offers insight into 120-plus cancer types and includes a section for the newly diagnosed.

• Cancer.org

  The American Cancer Society’s site, this is one of the most comprehensive and helpful, with resources and tips on everything from handling an insurance-claim denial to keeping records.

• Caring4Cancer.com

  This wellness-focused site offers a wide array of tips—from managing loss of appetite to exercise ideas—and a robust nutrition section with recipes.

• NCCN.org

  The National Comprehensive Cancer Network, an alliance of cancer centers, offers printable booklets taking you from diagnosis to treatment. Topics include terminology and common questions.