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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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Fainting - National Library of Medicine

Fainting is a temporary loss of consciousness. If you're about to faint, you'll feel dizzy, lightheaded, or nauseous. Your ... happens when your blood pressure drops suddenly, causing a decrease in blood flow to your brain. It ...

Gum Disease - National Library of Medicine

... and swollen. They can bleed easily. Gingivitis is a mild form of gum disease. You can usually ... daily brushing and flossing and regular cleanings by a dentist or dental hygienist. Untreated gingivitis can lead ...

Hair Loss - National Library of Medicine

... But many men -- and some women -- lose hair as they grow older. You can also lose your hair if you have certain diseases, such as thyroid problems, diabetes, or lupus. If you take ...

Heartburn - National Library of Medicine

Heartburn is a painful burning feeling in your chest or throat. It happens when stomach acid backs up into your esophagus, ... stomach. If you have heartburn more than twice a week, you may have GERD. But you can ...

Heat Illness - National Library of Medicine

... rise to dangerous levels and you can develop a heat illness. Most heat illnesses happen when you ... your risk. Heat-related illnesses include: Heat stroke - a life-threatening illness in which body temperature may ...

HIV and Infections - National Library of Medicine

... types of OIs: Bacterial infections, including tuberculosis and a serious related disease, Mycobacterium avium complex (MAC) Viral infections, such as cytomegalovirus (CMV) and hepatitis C Fungal infections, like ...

Household Products - National Library of Medicine

... toxic substances in different ways. At high doses, a toxic substance might cause birth defects or other ... containers they come in and use them exactly as the label says. Follow label directions or get ...

Infertility - National Library of Medicine

... means not being able to become pregnant after a year of trying. If a woman can get pregnant but keeps having miscarriages ... of couples are unable to get pregnant. About a third of the time, infertility can be traced ...

Kidney Cysts - National Library of Medicine

A cyst is a fluid-filled sac. You may get simple kidney cysts as you age; they are usually harmless. There are also ... cysts in other parts of the body, such as the liver. Often, there are no symptoms at ...

Leishmaniasis - National Library of Medicine

Leishmaniasis is a parasitic disease spread by the bite of infected sand flies. There are several different forms of leishmaniasis. The ... sores. The visceral type affects internal organs such as the spleen, liver, and bone marrow. People with ...

Low Blood Pressure - National Library of Medicine

... ve probably heard that high blood pressure is a problem. Sometimes blood pressure that is too low ... written one above or before the other, such as 120/80. If your blood pressure reading is ...

Male Breast Cancer - National Library of Medicine

... breast symptoms can include: Dimpled or puckered skin A red, scaly nipple or skin Fluid discharge Risk ... for male breast cancer include exposure to radiation, a family history of breast cancer, and having high ...

Managed Care - National Library of Medicine

Managed care plans are a type of health insurance. They have contracts with health care providers and medical facilities to provide care for members at ... choices usually cost you less. If you want a flexible plan, it will probably cost more. There ...

Measles - National Library of Medicine

Measles is an infectious disease caused by a virus. It spreads easily from person to person. It causes a blotchy red rash. The rash often starts on the head and moves ...

Medicare - National Library of Medicine

... term care. The program has four parts: Part A is hospital insurance Part B helps pay for medical services that Part A doesn't cover Part C is called Medicare ...

Medicines - National Library of Medicine

... may only need to take medicine once in a while. Either way, you want to make sure ... to think about these risks before you take a medicine. Even safe medicines can cause unwanted side ...



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