There are many reasons for shortness of breath when you move: First, it may be due to heart disease, such as coronary artery disease, which causes shortness of breath and chest tightness when you move more vigorously. If the shortness of breath is caused by heart disease, you should go to the hospital for heart examination, such as heart ultrasound, and if necessary, heart CT. second, it may be due to poor body resistance, lack of exercise, anemia and heart function diseases, which may also cause shortness of breath when you move. Find the cause of the disease.