Shortness of Breath

What is it?

Dyspnea — the subjective sense that breathing requires more effort than normal — is a major symptom in cardiopulmonary, hematologic, and psychiatric illness. Acute dyspnea (sudden onset) demands urgent evaluation to rule out life-threatening causes: pulmonary embolism, pneumothorax, acute heart failure, and severe asthma exacerbation. Chronic dyspnea, developing over weeks to months, points more to COPD, heart failure, anemia, or deconditioning. Exertional dyspnea that resolves at rest is a hallmark of cardiac and pulmonary disease.

Common causes

When to see a doctor

• 1Sudden severe shortness of breath at rest — call 911 immediately
• 2Shortness of breath with chest pain, coughing blood, or fainting
• 3Lips or fingernails turning blue (cyanosis)
• 4Breathing difficulty that wakes you from sleep
• 5Progressive worsening over days despite rest
• 6Shortness of breath in anyone with known heart or lung disease

What you can do

• ✓Sit upright or lean slightly forward — this position opens the airways
• ✓Practice pursed-lip breathing: inhale through the nose, exhale slowly through pursed lips
• ✓Avoid known triggers: smoke, allergens, extreme cold, and heavy exertion
• ✓For anxiety-related breathlessness: slow diaphragmatic breathing and grounding techniques
• ✓Use your rescue inhaler at the first sign of an asthma episode, not when severe
• ✓Lose weight if applicable — even modest weight loss significantly reduces exertional dyspnea

Conditions that cause this symptom

Medications that may help

Treatment depends on the underlying cause. Always consult your provider before starting any medication.

Frequently asked questions