A bacterial infection at the tip of the tooth root usually occurs from an untreated dental cavity, an injury or prior dental work.
Disease
Torn meniscus
Any activity that causes you to twist or rotate your knee, especially when putting your full weight on it, can cause this common knee injury.
Disease
Total anomalous pulmonary venous return (TAPVR)
In this heart condition present at birth, the lung's blood vessels attach to the wrong places in the heart. Know the symptoms and how it's diagnosed.
Disease
Tourette syndrome
The repetitive movements and sounds called tics that characterize Tourette syndrome can affect daily life — but there are ways to manage them.
Disease
Toxic hepatitis
Find out about symptoms and treatment of this liver disease. It's caused by exposure to certain substances, such as alcohol or medicines.
Disease
Toxic shock syndrome
This rare complication of some types of bacterial infections can be fatal. Learn about symptoms, risk factors and treatment.
Disease
Toxoplasmosis
Learn about symptoms, causes, treatment and prevention of this parasitic infection that can cause severe disease.
Disease
Tracheomalacia
Collapse of the windpipe happens most often in infants, but it can occur at any age. This condition makes it hard to breathe and can be life-threatening.
Disease
Trachoma
Trachoma is the leading preventable cause of blindness worldwide. Find out about symptoms, treatment and prevention of this serious eye disease.
Disease
Transient global amnesia
When your memory suddenly disappears, it can be frightening — but transient global amnesia is typically temporary and harmless.
Disease
Transient ischemic attack (TIA)
This short bout of stroke-like symptoms doesn't cause permanent damage. But it may serve as a warning sign of a future stroke.
Disease
Transposition of the great arteries
This serious, rare heart condition present at birth needs surgery to correct. Know the symptoms and treatment.