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Your child may come right out and ask you questions about gun violence. While it may catch you off guard, this is an opportunity to let them express their feelings.

Obesity hypoventilation syndrome (OHS) is a breathing problem. It affects some children who are obese. Poor breathing causes too much carbon dioxide and too little oxygen in the blood. This is a rare but life-threatening issue. Your child will need treatment right away.

A lung nodule is a small growth on the lungs.

Aortic valve regurgitation is when a person's aortic valve leaks. The aortic valve is 1 of the heart's 4 valves. These valves help the blood flow through the heart and out to the body. Normally, the aortic valve stops blood from flowing back into the left ventricle. With aortic valve regurgitation, some blood leaks back through the valve as the heart relaxes.

Pemphigus is a rare group of autoimmune diseases. It causes blisters on the skin and mucous membranes throughout the body. Pemphigus vulgaris is the most common type of pemphigus.

Ulcers are open skin sores. Venous ulcers are leg ulcers caused by problems with blood flow in your leg veins.

Wound healing sounds simple, but it's actually quite complicated and involves a long series of chemical signals. Certain factors can slow or prevent healing entirely.

Hyperbaric oxygen therapy, or HBOT, is a type of treatment used to speed up healing of carbon monoxide poisoning, gangrene, stubborn wounds, and infections in which tissues are starved for oxygen.

Wolff-Parkinson-White syndrome (WPW) is a type of abnormal heartbeat. If you have WPW, you may have episodes of tachycardia, when your heart beats very rapidly