12 Respiratory Conditions With Physical Signs Beyond Coughing

2. Pneumothorax - When Breathing Mechanics Fail

Spontaneous pneumothorax creates a unique constellation of physical signs that reflect the mechanical disruption of normal respiratory physiology, often manifesting through postural and movement-related symptoms that patients may not immediately associate with lung problems. The hallmark presentation involves sudden, sharp, unilateral chest pain that patients describe as "stabbing" or "tearing," typically occurring at rest or during minimal activity in young, tall, thin individuals. This pain characteristically worsens with deep inspiration and often radiates to the shoulder on the affected side due to phrenic nerve irritation. Patients instinctively adopt protective posturing, leaning toward the affected side and avoiding movements that expand the chest wall, creating an asymmetrical appearance during respiration. The affected hemithorax demonstrates reduced or absent chest wall movement during inspiration, while the unaffected side may show compensatory increased excursion. Tactile examination reveals decreased vocal fremitus and a hyperresonant percussion note over the pneumothorax, while auscultation demonstrates diminished or absent breath sounds. In larger pneumothoraces, tracheal deviation away from the affected side becomes apparent, and patients may develop subcutaneous emphysema, creating a distinctive crackling sensation under the skin around the neck and chest wall. The cardiovascular system responds with tachycardia and, in tension pneumothorax, signs of obstructive shock including hypotension, elevated jugular venous pressure, and paradoxical pulse. These mechanical disruptions highlight how pneumothorax affects not just gas exchange but the entire thoracic pump mechanism essential for both respiratory and cardiovascular function.