Master Heading Your Online Guide to Trusted Health Information Resources Terms Diseases and Health Conditions Item Definition Find information on various diseases, conditions and treatments. Health Topics A to Z Item Definition Explore health and wellness topics using the first letter of the word with an A to Z search. Healthy Living Item Definition Discover information on nutrition, physical activity, stress management and other topics which can contribute to a healthy life. Symptom Checkers Item Definition Search for information on various symptoms using an interactive tool and symptom lists. Drugs and Supplements Item Definition Find information on prescription drugs, over-the-counter medications, herbs and supplements. Lab Tests and Procedures Item Definition Find information about various laboratory tests and procedures—what they are used for, what the results may mean and more. Videos and Tools Item Definition Explore and watch videos on various health topics, including body systems and surgical procedures. Use interactive tools to learn more about your health.