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 sickbay with symptoms including intense apprehension, shortness of breath and dizziness. (VOY: "Retrospect")