Dyspnoea

Dyspnoea: Difficult or labored breathing; shortness of breath.

Dyspnoea is a sign of serious disease of the airway, lungs, or heart. The onset of dyspnoea should not be ignored but is reason to seek medical attention.

The word dyspnoea comes the Greek "dys-", difficulty + "pnoia", breathing = difficulty breathing.

Dyspnoea is the British spelling. The American is dyspnea.