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Bronchitis happens when the airways in the lungs become inflamed. This can cause coughing, often with mucus.


Bronchopulmonary Dysplasia (BPD)

Bronchopulmonary dysplasia, or BPD, is a long-term lung condition in which a baby’s lungs do not develop as they should after birth. It mostly affects newborns who are born too early and need extra oxygen after birth.



Cardiac Arrest

Cardiac arrest is a life-threatening condition in which the heart suddenly stops beating.


Cardiac Catheterization

Cardiac catheterization is a medical procedure used to take a close look at your heart to diagnose some heart conditions. It can also be used to treat a problem with your heart.


Cardiogenic Shock

Cardiogenic shock, also known as cardiac shock, happens when the heart cannot pump enough blood and oxygen to the brain and other organs. 



Cardiomyopathy refers to problems with the heart that can make it harder to pump blood.


Childhood Interstitial Lung Disease

Childhood interstitial lung disease (CHILD) is a group of rare lung diseases that can affect babies, children, and teens. These conditions can make it hard to breathe normally.


Circadian Rhythm Disorders

Circadian rhythm disorders, also known as sleep-wake cycle disorders, are problems that occur when your body’s internal clock is out of sync with your environment. 


Clinical Trials

The NHLBI leads and supports many clinical trials to help find new ways to prevent, detect, and treat heart, lung, blood, and sleep disorders.

Fact Sheets and Handouts

The NHLBI develops materials for patients and health professionals on many heart, lung, blood, and sleep conditions. Information from the NHLBI is based on the latest scientific findings.