What are the causes of shortness of breath in the elderly?

The elderly often have shortness of breath due to the weakness and degradation of cardiopulmonary function and lack of exercise. Many old people don't care much about shortness of breath, thinking that this is what people do when they are old. In fact, shortness of breath in the elderly is often an early sign of many diseases. Acute left heart failure is a heart disease emergency characterized by dyspnea, chest tightness, cough and asthma. The main manifestations are paroxysmal dyspnea at night, and severe asthma, which is more common in hypertension, coronary heart disease and valvular heart disease. Its premonitory symptom is that it likes to raise the pillow gradually when sleeping, and it is often disturbed by chest tightness and breathlessness.