dyspnea

n. labored breathing, shortness of breath

Dyspnea or Dyspnoea (Pronounced disp-nee-ah, from the Latin dyspnoea, Greek dyspnoia from dyspnoos, shortness of breath) or short of breath (SOB) is perceived difficulty breathing or painful breathing. It is a common symptom of numerous medical disorders.Dyspnea on exertion (DOE or exertional dyspnea) indicates dyspnea that occurs (or worsens) during physical activity.
See more at Wikipedia.org...

Dyspnea /dysp·nea/ labored or difficult breathing.dyspne´ic paroxysmal nocturnal dyspnea respiratory distress that awakens patients from sleep, [more]Dyspnea - Community and Resources

Noun
1. difficult or labored respiration
(synonym) dyspnoea
(hypernym) symptom
(hyponym) orthopnea

Apparent breathing distress usally a result of serious disease of the heart, lungs, or airways.