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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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Antibiotics - National Library of Medicine

... Taking antibiotics when they're not needed won't help you, and they can have side effects. ... treatment for you when you're sick. Don't ask your provider to prescribe an antibiotic for ...

Lymphoma - National Library of Medicine

... a type of white blood cell, called a T cell or B cell, becomes abnormal. The cell ... the body. Most of the time, doctors don't know why a person gets non-Hodgkin lymphoma. ...

Teen Sexual Health - National Library of Medicine

... human papillomavirus) Pubic lice Syphilis Trichomoniasis STDs don't always cause symptoms. So it is possible to ... getting tested before having sex. If you can't talk about STDs, you aren't ready to ...

Medicines and Children - National Library of Medicine

Children aren't just small adults. It is especially important to remember this when giving medicines to children. Giving a child ... side effects in your child The medicine doesn't appear to be working when you expect it ...

Sudden Cardiac Arrest - National Library of Medicine

... During a heart attack, the heart usually doesn't suddenly stop beating. With an SCA, the heart ... where the ventricles (the heart's lower chambers) don't beat normally. Instead, they beat very fast and ...

Vitamin D Deficiency - National Library of Medicine

... in vitamin D for different reasons: You don't get enough vitamin D in your diet You don't absorb enough vitamin D from food (a malabsorption problem) You don't get enough exposure to sunlight. Your liver or ...

Ataxia Telangiectasia - National Library of Medicine

Ataxia-telangiectasia (A-T) is a rare, inherited disease. It affects the nervous system, immune system, and other body systems. Symptoms appear in ... Delayed physical and sexual development People with A-T have an increased risk of developing diabetes and ...

Bullying and Cyberbullying - National Library of Medicine

... Have depression, anxiety, or low self-esteem Don't have many friends or are less popular Don't socialize well with others Have an intellectual or ... serious problem that causes harm. And it doesn't just hurt the person who is being bullied; ...

Cancer - National Library of Medicine

... wrong. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can ... can be benign or malignant. Benign tumors aren't cancer while malignant ones are. Cells from malignant ...

Diabetes Type 2 - National Library of Medicine

... energy. If you have diabetes, your body doesn't make enough insulin or doesn't use insulin well. The glucose then stays in ... is a condition in which your cells don't respond normally to insulin. As a result, your ...

Heart Valve Diseases - National Library of Medicine

... it from flowing backward. But sometimes they don't work properly. If they don't, you could have: Regurgitation - when blood leaks back ... the mitral valve, has "floppy" flaps and doesn't close tightly. It's one of the most common ...

Hepatitis B - National Library of Medicine

... hepatitis B? Often, people with hepatitis B don't have symptoms. Adults and children over 5 are ... tested for a disease even though you don't have symptoms. If you are at high risk, ...

Hypothyroidism - National Library of Medicine

... underactive thyroid, happens when your thyroid gland doesn't make enough thyroid hormones to meet your body's ... swallowing. Because hypothyroidism develops slowly, many people don't notice symptoms of the disease for months or ...