Shortness of breath when the elderly walk is mostly due to aging factors, emphysema, chronic obstructive pulmonary disease and so on. 1. Aging factor: with the gradual increase in age, the body’s resistance is weaker, and the lung capacity will decline, if the elderly walk too fast or walk for a long time, the phenomenon of shortness of breath will occur, which is a normal body reaction. 2. Emphysema: the disease will cause damage to the alveoli, early symptoms may not be obvious, but with the aggravation of the disease, there will be exertion shortness of breath, the elderly walking fast will have shortness of breath phenomenon. 3. Chronic obstructive pulmonary disease: mainly airflow persistent restriction characterized by a lung disease, the patient will be manifested as dyspnea, especially in activities, such as walking will feel short of breath, dyspnea. Elderly people will be short of breath when walking, if excluded is caused by age factors, should promptly go to the hospital to find out the cause of targeted treatment.