Dyspnea

Difficult or labored breathing.

Labored or difficult breathing, generally indicating an insufficient amount of oxygen in the blood.

Shortness of breath or labored, difficult breathing; causes include strenuous activity, lung disorders, heart disease, and extreme stress or tension.

The sensation of difficult, labored, or uncomfortable breathing. Dyspnea can vary widely in severity. It may be experienced as the result of many conditions, ranging from overexertion to serious illnesses, such as chronic obstructive pulmonary disease (COPD) or asthma. Other conditions that produce dyspnea include anxiety, interstitial pulmonary fibrosis, anemia, neuromuscular disorders, pneumonia, lung cancer, and heart disease.

Labored or difficult breathing. (The term is often used for a sign of labored breathing apparent to the doctor, breathlessness being used for the subjective feeling of labored breathing.) Dyspnea can be due to obstruction to the flow of air into and out of the lungs (as in bronchitis and asthma), various diseases affecting the tissue of the lung (including pneumoconiosis, emphysema, tuberculosis, and cancer), and heart disease.

Air hunger resulting in labored or difficult breathing, sometimes accompanied by pain. It is normal when due to vigorous work or athletic activity, but should quickly return to normal when the activity ceases.

Encountering respiratory distress, typically correlated with cardiac or pulmonary ailments.