Croup is a type of respiratory infection that is usually caused by a virus. The infection leads to swelling inside the {trachea}[is a cartilaginous tube that connects the larynx to the bronchi of the lungs, allowing the passage of air], which interferes with normal breathing and produces classic symptoms that may be mild, moderate, or severe. Often it starts or is worse at night and normally lasts one to two days. Croup can be caused by a number of viruses including parainfluenza and influenza virus. Rarely is it due to a bacterial infection.

Croup is a type of respiratory infection that is usually caused by a virus. The infection leads to swelling inside the trachea, which interferes with normal breathing and produces classic symptoms that may be mild, moderate, or severe. Often it starts or is worse at night and normally lasts one to two days. Croup can be caused by a number of viruses including parainfluenza and influenza virus. Rarely is it due to a bacterial infection.

Drooling

Dysphagia

Sore throat

Cough

Fatigue

Nasal congestion

Rhinorrhea

Fever

Hoarseness

Stridor

Tachypnea

Croup