BAsic information description Collapse of lung tissue affecting part or all of one lung. It prevents normal lung function. Atelectasis can affect all ages, but is more common in children under age 10. frequent signs and symptoms Sudden, major collapse: Chest pain. Shortness of breath; rapid breathing. Shock (weakness, pale skin, rapid heartbeat). Dizziness. Gradual collapse: Cough. Fever. Shortness of breath. Sometimes, no symptoms are noticed. causes ...