PRACTICAL HEALTH · SYMPTOMS
🫁 Shortness of breath
Shortness of breath can occur for many reasons. Sudden or severe breathing difficulty may represent a medical emergency.
What should you notice?
- Whether it began suddenly or gradually.
- Whether it occurs at rest or with activity.
- Chest pain, wheezing or fever.
- Blue or gray lips or skin.
- Leg swelling, fainting or confusion.
Possible causes
These are examples, not a diagnosis. The same symptom can have many different causes.
- Respiratory infections.
- Asthma and other lung diseases.
- Heart conditions.
- Anemia and other systemic conditions.
- Anxiety can cause breathlessness, but dangerous physical causes must not be overlooked.
What can you do initially?
- Stop strenuous activity and sit upright if that helps breathing.
- Use prescribed rescue medication only as directed for a known condition.
- Seek assessment for new, unexplained or worsening breathlessness.
🚨 Warning signs
- Severe or sudden difficulty breathing.
- Breathlessness with chest pain, fainting or confusion.
- Blue or gray lips or skin.
- Rapid deterioration or inability to speak normally because of breathlessness.
If you believe the situation is life-threatening, call 911 in the United States.
Medical sources
Medical review: September 2026.
Educational information: This page provides general health information. It does not establish a diagnosis, prescribe treatment or replace evaluation by a qualified healthcare professional.