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MedlinePlus is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). It was built as an online health information resource for patients and their families and friends.

MedlinePlus presents high-quality, easy to understand, relevant health and wellness information that is trusted.

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Anxiety - National Library of Medicine

What is anxiety? Anxiety is a feeling of fear, dread, and uneasiness. It might cause you to sweat, feel restless and tense, and have a rapid heartbeat. ...

Aphasia - National Library of Medicine

What is aphasia? Aphasia is a language disorder that makes it hard for you to read, write, and say what you mean to say. Sometimes it makes it hard to ...

Asthma - National Library of Medicine

What is asthma? Asthma is a chronic (long-term) lung disease. It affects your airways, the tubes that carry air in and out of your lungs. When you have ...

Bereavement - National Library of Medicine

Bereavement is the period of grief and mourning after a death. When you grieve, it's part of the normal process of reacting to a loss. You may experience grief as ...

Bird Flu - National Library of Medicine

Birds, just like people, get the flu. Bird flu viruses infect birds, including chickens, other poultry, and wild birds such as ducks. Usually bird flu viruses ...