Walking fast breathlessness is mainly seen in: 1, heart disease, such as cardiac insufficiency, angina pectoris; 2, respiratory diseases, such as old slow branch, lung function is weakened; 3, obese patients lack of exercise, this phenomenon does not necessarily belong to the pathology. If there is such a situation can go to the hospital to check the heart, electrocardiogram, lung CT, cardiac ultrasound, may have a chronic disease to do treatment, if there is no obvious chronic disease, do some exercise, jogging, deep breathing such, pay attention to control the obesity situation.