Dyspnea (or shortness of breath) was a medical term describing a sensation of difficulty in breathing.
Doctor Julian Bashir downloaded data about dyspnea, coughing, and other pulmonary disorders onto a PADD shortly before he left to attend a medical conference on Casperia Prime in 2374. (DS9: "Inquisition")
Later that year, Seven of Nine experienced an acute anxiety attack after being scanned by The Doctor in the USS Voyager's sickbay, with symptoms including intense apprehension, shortness of breath, and dizziness. (VOY: "Retrospect")