Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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  • Strabismus

    Learn about the causes of and treatments for strabismus, or cross-eyes.

  • Strep Throat

    Strep throat is an infection caused by bacteria. It is called “strep” because the bacteria that causes the infection is…

  • Stroke

    Stroke is a medical condition that occurs when the blood flow to your brain stops. It can lead to serious…

  • Stuttering

    Stuttering is a problem commonly associated with childhood, but, for some people, it can last a lifetime.

  • Sty

    A sty is a painful, red bump that forms on the edge of your eyelid. It’s usually not serious and…

  • Substance Abuse

    Substance abuse can happen when products aren’t used in the right way. Prescription medicines, illegal drugs, tobacco, and alcohol can…

  • Sudden Infant Death Syndrome (SIDS)

    Sudden infant death syndrome (SIDS) is the somewhat unexplained reason a baby under the age of 1 dies in its…

  • Syphilis

    Syphilis is a serious infection passed from one person to another through sexual contact.

  • Teeth Grinding (Bruxism)

    Teeth grinding, also called bruxism, is the conscious or unconscious grinding of teeth that happens most often in children.

  • Tennis Elbow

    Tennis elbow (lateral epicondylitis) is a common condition that occurs when the outer tendons of the elbow swell or…

  • Testicular Cancer

    Testicular cancer can occur in one or both of a man’s testicles. Learn about the symptoms and how to detect…

  • Testicular Torsion

    Testicular torsion is when a testicle becomes twisted, restricting its blood supply. If not treated quickly, the testicle can become…

  • Thalassemia

    Thalassemia is a group of inherited blood disorders that prevent your body from producing the amount of hemoglobin it…

  • Thrush

    Thrush is a yeast infection that occurs on your tongue and the lining of your mouth.

  • Thyroid Nodules

    Learn about the symptoms of, tests for and treatments of thyroid nodules.

  • Thyroiditis

    Learn about the types, symptoms, causes, diagnosis and treatment of thyroiditis, a name for several disorders that cause inflammation of…

  • Tick-Borne Relapsing Fever

    Learn about tick-borne relapsing fever and how it is treated.

  • Tics and Tourette Syndrome

    Tourette syndrome causes a person to involuntarily make repeated twitches, movements, or sounds called tics that begin in childhood.

  • Tinnitus

    Tinnitus causes you to hear a noise in one ear or both ears. People call it ringing in the ear…

  • Tobacco Addiction

    Tobacco addiction is caused by a dependency on nicotine and habits formed by smoking or using chewing tobacco. With the…