Dyspnea, also known as laboured breathing, is a medical term used to describe difficulty in breathing. It is characterized by shortness of breath, difficulty in breathing, and an increased effort to breathe. Dyspnea can be caused by a variety of conditions, including asthma, COPD, heart failure, and other respiratory diseases. It can also be caused by physical exertion or emotional stress. Treatment for dyspnea depends on the underlying cause, but may include medications, oxygen therapy, lifestyle changes, and breathing exercises.