Shortness of breath can come from lungs, heart, anemia, anxiety, or infection. The key is recognizing when it’s urgent.
Call 911 now if
- You can’t speak full sentences
- Blue/gray lips or severe chest pain
- Confusion, fainting, or severe weakness
- Rapid worsening breathing difficulty
Common causes
- Viral infection
- Asthma/allergies
- COPD flare (especially in smokers/former smokers)
- Deconditioning
- Anxiety/panic
- Heart-related causes
What may help at home (mild cases)
- Rest, hydration, avoid triggers, use prescribed inhalers as directed.
When to book a visit
- New wheeze, persistent cough, fever with worsening symptoms, or reduced exercise tolerance.
Next step
More resources: Lungs & Breathing. If breathing feels significantly worse than usual, don’t wait—seek urgent evaluation.
Last reviewed: Dec 28, 2025