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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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Porphyria - National Library of Medicine

Porphyrias are a group of genetic disorders caused by problems with how your body makes a substance called heme. Heme is found throughout the ... Treatment may involve avoiding triggers, receiving heme through a vein, taking medicines to relieve symptoms, or having ...

Psoriatic Arthritis - National Library of Medicine

Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. You usually get ... at the same time. Your doctor will do a physical exam and imaging tests to diagnose psoriatic ...

Psychotic Disorders - National Library of Medicine

... delusions and hallucinations. Delusions are false beliefs, such as thinking that someone is plotting against you or ... you secret messages. Hallucinations are false perceptions, such as hearing, seeing, or feeling something that is not ...

Rickets - National Library of Medicine

... containing vitamin D because of lactose intolerance or a strict vegetarian diet Is breastfed without receiving vitamin ... t make or use vitamin D because of a medical disorder such as celiac disease In addition ...

Rotavirus Infections - National Library of Medicine

Rotavirus is a virus that causes gastroenteritis. Symptoms include severe diarrhea, vomiting, fever, and dehydration. Almost all children in the U.S. ... to other children and sometimes to adults. Once a child gets the virus, it takes about two ...

Sexual Problems in Men - National Library of Medicine

... men have sexual problems. They become more common as men age. Problems can include: Erectile dysfunction Reduced ... function are common. If problems last more than a few months or cause distress for you or ...

Syphilis - National Library of Medicine

Syphilis is a sexually transmitted infection (STI) caused by bacteria. It infects the genital area, lips, mouth, or anus of both ... pregnancy. The early stage of syphilis usually causes a single, small, painless sore. Sometimes it causes swelling ...

Tears - National Library of Medicine

You may only think of tears as those salty drops that fall from your eyes when you cry. Actually, your tears clean your eyes every time you blink. Tears ...

Teen Violence - National Library of Medicine

... into young adulthood. The young person can be a victim, an offender, or a witness to the violence. Violent acts can include: ... kicking, slapping, or hitting Use of weapons such as guns or knives Some violent acts can cause ...

Thyroid Diseases - National Library of Medicine

Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body ... thyroid diseases, your health care provider may use a medical history, physical exam, and thyroid tests. In ...

Thyroid Tests - National Library of Medicine

Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body ... help find the cause of thyroid diseases such as hyperthyroidism and hypothyroidism. Thyroid tests include blood tests ...

Tourette Syndrome - National Library of Medicine

... rarely, blurt out swear words. Tourette syndrome is a disorder of the nervous system. It often occurs with other problems, such as: Attention deficit hyperactivity disorder (ADHD) Obsessive-compulsive disorder ( ...

Traveler's Health - National Library of Medicine

Traveling can increase your chances of getting sick. A long flight can increase your risk for deep ... use iodine tablets. Food poisoning can also be a risk. Eat only food that is fully cooked ...

Trichomoniasis - National Library of Medicine

Trichomoniasis is a sexually transmitted infection (STI) caused by a parasite. It spreads from person to person during sex. Many people ... early, and their babies are more likely have a low birth weight. Lab tests can tell if ...



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