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Hives are raised, red, itchy bumps on the skin. The bumps come and go for a few days and then go away completely. Here's what you need to know.

A detailed look at nasal allergies, and what to do when they affect your child.

An arrhythmia can cause your child's heart to pump blood less efficiently. Many arrhythmias are harmless and don't need to be treated. But if it causes symptoms, it may need treatment.

Catheter ablation is a way to treat a tachycardia. This is an abnormal heart rhythm (arrhythmia) in which the heart beats too fast.

The heart makes sounds as the heart valves open and close to allow blood to flow through the heart. When blood does not flow smoothly through the heart or heart valves, it causes the noise. This is called turbulence. Heart murmurs can be harmless (innocent) or caused by a heart problem (pathologic).

Your child needs surgery to treat a heart problem. This sheet will help you and your child get ready for the surgery.

Learn how the heart works.

Whooping cough (pertussis) is a bacterial infection of the respiratory tract. It is highly contagious and spreads easily from person to person through droplets when an infected person coughs, sneezes, or talks.

The pleural space is the area between the lung and the chest wall. If air, blood, or fluid gets into this space, it can be a problem. This air, fluid, or blood can cause one or both lungs to collapse, which makes breathing difficult. A chest tube can drain the pleural space. This tube is soft and flexible. Your child may need a chest tube to prevent their lung from collapsing. Or they may need it to allow the lung to expand after collapsing.