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What is Wolff-Parkinson-White syndrome? Wolff-Parkinson-White (WPW) syndrome is a heart condition. People who have WPW syndrome are born with an extra electrical pathway in their heart. It changes ...

What is stuttering? Stuttering is a condition that affects a person’s ability to speak smoothly. It can cause them to repeat words, parts of sentences, or sounds. Someone who stutters might prolong...

What is a sty? A sty is a painful, red bump that forms on the edge of your eyelid. It may look like an acne pimple. Sties may cause discomfort, but they are not usually serious and are easy to trea...

Substance use disorder can happen when some products aren’t used in the right way. This includes prescription medicines, over-the-counter medicines, recreational and illegal drugs, tobacco, and alc...

What is bruxism? Teeth grinding, also called bruxism, is the conscious or unconscious grinding or clenching of teeth. It happens most often in children. About 20% to 30% of children grind their tee...

What is tennis elbow? Tennis elbow is another name for lateral epicondylitis. It occurs when the tendons that attach the muscle to the bone on the outside part of the elbow swell or tear. This weak...

What is Tourette syndrome? Tourette syndrome is a movement disorder that starts in childhood. It causes a person to make repeated twitches, movements, or sounds that they have little or no control ...

Tinnitus causes a persistent ringing, buzzing, or hissing sound in the ears—and it can affect your focus, sleep, and overall well-being. While it’s not a disease itself, tinnitus often signals an u...

What is tonsillitis? Tonsillitis is an inflammatory disease. It occurs when your tonsils become infected by a virus or bacteria. Tonsils are the oval-shaped areas of pink tissue at the back of your...

What is tuberculosis? Tuberculosis, also called TB, is an infection caused by bacteria. Tuberculosis usually affects the lungs. But it can also affect other parts of the body. This could include th...