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• A to Z: Sprain, Ankle

  Ankle sprains are common in kids and teens who play sports. They happen when the ligaments that support the ankle get overly stretched or torn.

• A to Z: Sprain, Knee

  A knee sprain happens when a ligament is stretched or torn because the knee gets twisted, bent, or hit.

• A to Z: Sprain, Wrist

  A sprain is the stretch or partial tear of ligaments (which connect two bones). A wrist sprain happens when the ligaments that support the wrist bend or twist too far.

• A to Z: Stevens-Johnson Syndrome

  Learn about problems of the immune system and adverse reactions to drugs or infections.

• A to Z: Stomatitis

  Learn about stomatitis, an inflammation of the mouth.

• A to Z: Strabismus

  Strabismus is when the eyes are not lined up correctly.

• A to Z: Strep Throat

  Strep throat, a painful throat infection, is common in kids and teens. It gets better quickly with antibiotic treatment.

• A to Z: Sturge-Weber Syndrome

  Learn about this genetic disorder that can cause a birthmark on the face called a port-wine stain, as well as other symptoms.

• A to Z: Stye

  A stye is a red, painful bump on the eyelid caused by a backed-up oil gland.

• A to Z: Subconjunctival Hemorrhage

  A subconjunctival hemorrhage is a harmless red spot on the white of the eye.