Exertional dyspnea - Definition

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Dyspnea is a difficulty breathing, and it's called exertional dyspnea when the breathing problem occurs exclusively during exercise. Exertional dyspnea does not indicate a lung disease, but is indicative of heart failure. It appears in response to the inability of the heart to adapt to the increased needs of the body during exercise. The further the disease involved progresses, the more this difficulty breathing will occur during minimal effort; at an advanced stage, it appears even at rest.