The American Academy of Otolaryngology—Head and Neck Surgery (AAO-HNS) is the world's largest organization of physicians dedicated to the care of ear, nose, and throat (ENT) disorders. Its Web site includes information for the general public on ENT disorders.

The American Cancer Society (ACS) conducts educational programs and offers many services to people with cancer and to their families. Staff at the toll-free number have information about services and activities in local areas and can provide referrals to local ACS divisions.

The American Thyroid Association promotes scientific and public understanding of thyroid disorders. It publishes a monthly journal and manages a Web site.

Cancer.Net is the information website of the American Society of Clinical Oncology (ASCO) for people living with cancer and for those who care for them. ASCO is the world's leading professional organization representing physicians of all oncology subspecialties. Cancer.Net provides current oncologist-approved information on living with cancer.

The National Cancer Institute (NCI) is a U.S. government agency that provides up-to-date information about the prevention, detection, and treatment of cancer. NCI also offers supportive care to people who have cancer and to their families. NCI information is also available to doctors, nurses, and other health professionals. NCI provides the latest information about clinical trials. The Cancer Information Service, a service of NCI, has trained staff members available to answer questions and send free publications. Spanish-speaking staff members are also available.