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.
Tay-Sachs disease is a rare, inherited disease. It is a type of lipid metabolism disorder. It causes too much of a fatty substance to build up in the brain. ...
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 ...
What is depression in teens? Depression in teens (ages 13-17) is a serious medical illness. It's more than just a feeling of being sad or "blue" for a few ...
As a teenager, you go through many physical, mental, emotional, and social changes. The biggest change is puberty, the process of becoming sexually mature. ...
As a teenager, you go through many changes. Your body is on its way to becoming its adult size. You may notice that you can't fit into your old shoes or ...
Being a teenager is hard. You're under stress to be liked, do well in school, get along with your family, and make big decisions. You can't avoid most of these ...
What is teen sexual health? Teen sexual health is about how sex affects your physical and emotional health. It means knowing how to form healthy relationships ...
Teen violence refers to harmful behaviors that can start early and continue into young adulthood. The young person can be a victim, an offender, or a witness ...
Most teenage girls don't plan to get pregnant, but many do. Teen pregnancies carry extra health risks to both the mother and the baby. Often, teens don't ...
What is telehealth? Telehealth is the use of communications technologies to provide health care from a distance. These technologies may include computers, ...
What are temporomandibular disorders (TMDs)? Temporomandibular disorders (TMDs) are a group of more than 30 conditions that affect your temporomandibular ...
Tendons are flexible bands of tissue that connect muscles to bones. They help your muscles move your bones. Tendinitis is the severe swelling of a tendon. Tendinitis ...
What is testicular cancer? Testicular cancer is a cancer that develops in the tissues of one or both testicles. The testicles, or testes, are part of ...
Testicles, or testes, make male hormones and sperm. They are two egg-shaped organs inside the scrotum, the loose sac of skin behind the penis. It's easy to injure ...
Tetanus is a serious illness caused by Clostridium bacteria. The bacteria live in soil, saliva, dust, and manure. The bacteria can enter the body through a deep ...
Tetanus, diphtheria, and pertussis (whooping cough) are serious bacterial infections: Tetanus is an uncommon disease that requires immediate treatment in a hospital. ...
Thalassemias are inherited blood disorders. If you have one, your body makes fewer healthy red blood cells and less hemoglobin. Hemoglobin is a protein that carries ...
Thoracic outlet syndrome (TOS) causes pain in the shoulder, arm, and neck. It happens when the nerves or blood vessels just below your neck are compressed, or ...
Throat cancer is a type of head and neck cancer. Throat cancer has different names, depending on which part of the throat is affected. The different parts of ...
Your throat is a tube that carries food to your esophagus and air to your windpipe and larynx. The technical name for your throat is the pharynx. Throat problems ...