Health Topics | CDC Skip directly to site content Skip directly to search An official website of the United States government Here's how you know Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites. Health Topics Search Search Clear Search search clear search Health Topics Explore Topics Find diseases and conditions; healthy living; workplace safety; environmental health; injury, violence and safety, global health and more. Browse by Letter What is the Health Topics A-Z Index? The Health Topics A-Z Index is a navigational and informational tool that makes the CDC.gov website easier to use. It helps you quickly find and retrieve specific information. Synonyms, acronyms, and cross-references provide multiple ways for you to access the topics and features on CDC.gov. The index includes common and scientific terms to meet the needs of consumers as well as health professionals. The Health Topics A-Z Index lists topics with relevance to a broad cross-section of CDC.gov’s audiences. The items are representative of popular topics, frequent inquiries, or have critical importance to CDC’s public health mission. The index will continue to evolve as additional topics are added. Contact Us Contact Us Call 800-232-4636 Contact CDC About CDC About CDC Pressroom Organization Budget & Funding Careers & Jobs Policies Accessibility External Links Privacy Web Policies FOIA OIG No Fear Act Nondiscrimination Vulnerability Disclosure Policy Languages Languages Español Language Assistance Español 繁體中文 Tiếng Việt 한국어 Tagalog Русский العربية Kreyòl Ayisyen Français Polski Português Italiano Deutsch 日本語 فارسی English Archive CDC Archive Public Health Publications Contact Us Contact Us Call 800-232-4636 Contact CDC About CDC Pressroom Organization Budget & Funding Careers & Jobs About CDC Policies Accessibility External Links Privacy Web Policies FOIA OIG No Fear Act Nondiscrimination Vulnerability Disclosure Policy Languages Languages Español Language Assistance Español 繁體中文 Tiếng Việt 한국어 Tagalog Русский العربية Kreyòl Ayisyen Français Polski Português Italiano Deutsch 日本語 فارسی English Archive CDC Archive Public Health Publications HHS.gov USA.gov