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• A to Z Symptom: Headache

  Headaches are common in kids and teens, and can have a wide range of causes. Most can be managed at home.

• A to Z: Hand, Foot, and Mouth Disease

  Hand, Foot, and Mouth disease is a common contagious illness caused by viruses from the enterovirus family, most commonly the coxsackievirus.

• A to Z: Hashimoto’s Thyroiditis

  Hashimoto’s thyroiditis is a chronic (ongoing) condition where the body’s immune system attacks the thyroid, a gland in the neck that makes thyroid hormone.

• A to Z: Hay Fever

  See: Rhinitis, Allergic.

• A to Z: Head Injury

  Learn more about head injuries (head trauma).

• A to Z: Hearing Loss, Conductive

  Learn about causes of hearing loss and conditions that can affect the outer ear and middle ear.

• A to Z: Hearing Loss, Mixed

  Learn about causes of hearing loss and conditions that can affect the ear and auditory nerve.

• A to Z: Hearing Loss, Neural

  Learn about causes of hearing loss and conditions that can affect the auditory nerve.

• A to Z: Hearing Loss, Perceptive

  See: Hearing Loss, Sensorineural.

• A to Z: Hearing Loss, Sensorineural

  Learn about causes of hearing loss and conditions that can affect the inner ear and auditory nerve.