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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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Heroin - National Library of Medicine

What is heroin? Heroin is an illegal, very addictive opioid drug. It's made from morphine, which comes from the seedpod of opium poppy plants. These plants ...

Peptic Ulcer - National Library of Medicine

... them worse. To see if you have an H. pylori infection, your doctor will test your blood, ... to reduce stomach acids or antibiotics to kill H. pylori. Antacids and milk can't heal peptic ...

Meningitis - National Library of Medicine

Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common ...