Your child's asthma may be triggered by a number of things: pollen, molds, certain foods, strong odors, or even exercise.

Detailed information on asthma, including triggers of an asthma attack, symptoms, diagnosis, management, and treatment

Anaphylaxis is a severe and sometimes life-threatening reaction to an allergen. An allergen is something that your child is allergic to. Anaphylaxis is a medical emergency. Your child can have a reaction within seconds or as long as an hour after contact.

Detailed information on allergy, including symptoms, diagnosis, and treatment

X-linked agammaglobulinemia is a rare genetic disease that causes a weakened immune system. It mainly affects boys.

Detailed information on cardiovascular diseases in children

Detailed information on the immune system and how it works.

Detailed information on problems involving heart rhythm

Detailed information on what to expect when your child has a physical exam to help find possible heart conditions, or to find out how well your child is coping with existing heart problems.

Pericarditis is inflammation or infection of the pericardium. In children, pericarditis is most likely to happen after surgery to repair heart defects.