Egg allergy

Egg allergy can cause a serious reaction in children and adults. Here's how to recognize egg allergy symptoms, and what to do if a severe reaction occurs.

Obsessive-compulsive disorder

Irresistible urges to repetitively count, check or wash are common obsessive-compulsive disorder symptoms. Treatment can help, so don't let shame hold you back.

Peanut allergy

Peanut allergy can be serious. Find out what you need to know to prevent a life-threatening reaction.


Phenylketonuria is a rare birth defect for which newborns are routinely screened. This rare birth defect requires a special diet to prevent mental retardation.

Poison ivy rash

Poison ivy can cause an itchy, blistering rash. Several self-care methods can help treat this irritating rash and reduce your discomfort.

Seborrheic dermatitis

Stubborn, itchy dandruff can be a sign of seborrheic dermatitis. Find out what you can do to treat this flaky skin condition.

Shellfish allergy

Jun. 29, 2013

You Are ... The Campaign for Mayo Clinic

Mayo Clinic is a not-for-profit organization. Make a difference today.