Understanding Breathlessness: Anxiety vs. Medical Conditions

"Air hunger" (difficulty taking a deep breath) and dyspnea (shortness of breath) are distinct sensations with overlapping causes.

Air Hunger / "Can't Catch Breath"

• Anxiety/panic: hyperventilation → hypocapnia → cerebral vasoconstriction → paresthesias, lightheadedness.
• Dysfunctional breathing: upper chest, rapid, sighing pattern.
• Asthma/COPD: dynamic hyperinflation limits inspiratory capacity.
• Restrictive disease: fibrosis, obesity, neuromuscular weakness.

Dyspnea

Multidimensional: sensory (effort, tightness), affective (fear), impact. Causes: cardiac (HF, ischemia), pulmonary (PE, pneumonia), hematologic (anemia), metabolic (acidosis), deconditioning.

Differentiation

• Anxiety: improves with distraction, rebreathing (paper bag), normal exam/SpO₂.
• Organic: exertional progression, objective findings (wheeze, crackles, edema, hypoxia).

Coexistence is common (e.g., asthma + panic). Treat both.