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Acute, or short-term, bronchitis occurs when the bronchial tubes are irritated by a virus, bacteria, or allergen. This causes a cough that makes yellow or greenish mucus.

A nasal fracture (broken nose) is a break in one or more of the bones of the nose. Learn more about nasal fractures in children, including causes, symptoms, and diagnosis.

Bronchiectasis is a condition in which the lungs' airways are damaged and become wider than normal. Here's what to know about this condition.

Learn details about treating your child's broken nose. Treatment is based on your child’s age, overall health, and the type of injury.

When you have bronchiectasis, the airways of the lungs become wider than normal. These airways are called bronchi and bronchioles. Over time the walls of the airways become thick and scarred. The damaged airways can’t clear mucus as well. Because of this, mucus builds up in the airways. This increases the risk for lung infections. Bronchiectasis is a long-term (chronic) condition.

A gastrocnemius muscle tear is a severe, sudden injury to your calf muscle.

A fracture of the clavicle is a broken collarbone. Clavicle fractures occur most often along the middle of the bone. Depending on how badly the bone is broken, healing may take a few months or longer.

Any abnormal change in the speed or pattern of the heartbeat is called an arrhythmia. An arrhythmia that causes the heart to beat slower than normal is called bradycardia.

Tissue expanding slowly stretches a healthy patch of skin. The extra skin is used to cover or replace scarred skin. Learn what to expect if your child is having this treatment.