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 conducts educational programs and offers many services to people with cancer and to their families. Staff at the toll-free numbers 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 an informational Web site.

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 with 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.