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Heart failure in children occurs when a child’s heart is not working as well as it should.

Chiari malformation is an abnormality in the back of the head where the brain and spinal cord meet.

Allergies are an overreaction of the immune system. They happen when the immune system fights harmless foreign substances called allergens.

Bronchiolitis is an infection of the lower respiratory tract that usually affects infants.

Children who are allergic to animals are reacting to animal proteins found in dander, saliva, and urine.

Epiglottitis is a life-threatening bacterial infection that occurs when the epiglottis swells, obstructing the flow of air into the lungs.

Monkeypox (MPX) is a viral infection that can cause a painful rash, fever, head and muscle aches, and exhaustion.

Appendicitis is a painful swelling and infection of the appendix.

Autoimmune disease is when the immune system mistakenly begins attacking healthy cells and tissues.