Difficulty breathing can occur when the body's lungs or heart are not working well.

Symptoms of moderate difficulty breathing

• Air hunger. The person feels like he or she can't get enough air.
• Shallow or slightly labored breathing
• Difficulty breathing at rest or after even mild exertion
• Shortness of breath that makes speaking difficult

Symptoms of severe difficulty breathing

• Chest tightness so severe that the person is worried being strong enough or able to keep breathing
• Shortness of breath makes speaking almost impossible
• Severe wheezing
• Anxiety, fear, agitation, or restlessness
• Extreme drowsiness, difficulty waking up, or responding slowly (lethargy)