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Information about specific heart, lung, blood, and sleep disorders can be found in our online science-based, plain language Health Topics articles. The A to Z index on this webpage should help you find articles on diseases, conditions, tests, procedures, and other relevant topics, which you can print and share.
NHLBI adheres to National Institutes of Health standards for information quality. Learn about Plain Writing at NIH.
The NHLBI does not give medical advice, render second opinions, provide referrals to doctors, or counsel individuals on specific medical problems. Advice on treatment or care of an individual patient should be obtained through consultation with a physician or other health professional who has examined the patient and is familiar with the patient's medical history.
The NIH Clinical Center provides an opportunity for healthy volunteers to participate in medical research studies (sometimes called protocols or trials). Healthy volunteers provide researchers with important information for comparison with people who have specific illnesses. Every year, nearly 3,500 healthy volunteers participate in studies at the NIH. If you are interested in volunteering for an NHLBI study, the NIH Office of Patient Recruitment, (prpl@mail.cc.nih.gov) can help you.
Contact the NHLBI Center for Health Information at nhlbiinfo@nhlbi.nih.gov or 1-877-NHLBI4U (1-877-645-2448). Open Monday through Friday, 8:30 a.m. to 5 p.m. Eastern time (closed on Federal holidays). After hours, you may leave a voicemail message or send an email, and your inquiry will be answered the next business day.
For access to free Telecommunications Relay Services (TRS), dial 7-1-1 on your telephone.
NHLBI Center for Health Information
P.O. Box 30105
Bethesda, MD 20824-0105
United States