Acute pulmonary edema etiology mainly includes cardiac and non-cardiac causes. The former can be seen in valvular diseases of the heart, with left heart failure caused by coronary atherosclerotic heart disease, hypertensive heart disease, etc. The latter can be seen in severe infections of the lungs and as a result of trauma, pneumothorax, pulmonary atelectasis, etc. Both are causes of acute pulmonary edema. The most meaningful diagnosis is the presence of symptoms of dyspnea, with wheezing, shortness of breath, and even cyanosis of the skin mucosa, etc. In addition, the patient may appear to have telangiectatic breathing, with coughing of large amounts of pink foamy sputum. The most clinically significant tests include CT of both lungs and pulmonary function tests, which can provide clear and timely treatment.