Pink frothy sputum is most often caused by the infiltration of fluid from the capillaries into the interstitium or alveoli of the lungs. The common clinical causes of pulmonary edema are cardiogenic pulmonary edema and nephrogenic pulmonary edema. So, what tests are needed for patients coughing up pink foamy sputum? The following are the examination items that need to be done for coughing up pink foamy sputum: I. Key points of history taking. 1. The time when the original symptoms such as cough and sputum occurred, whether they were prolonged and recurrent, and whether they were combined with shortness of breath. 2. Whether or not gradually worsening dyspnea and exertional shortness of breath occur on the basis of the original symptoms of cough and cough. Initially, patients have shortness of breath when working, going upstairs or climbing mountains or hills, but as the disease develops, they feel shortness of breath even when moving on flat ground or even at rest. 3. History of combined lung infections. When combined with pulmonary infection, there is often an increase in bronchial secretions, and ventilation dysfunction is further aggravated by chest tightness and shortness of breath, and the diagnosis of emphysema is the appearance of respiratory failure symptoms such as cyanosis, headache, drowsiness, and confusion in severe cases. Second, the main points of physical examination. 1. Early physical signs are not obvious. 2. With the development of the disease, emphysema signs appear: the anterior and posterior diameter of the thorax increases in a barrel-shaped chest, the rib space becomes wider, and the respiratory movement is weakened. Palpation fibrillation is weakened or disappeared. The percussion of emphysema examination shows over-clear sound, the lower lung and liver turbid borders are shifted down, and the heart turbid borders are narrowed or not easily percussed. On auscultation, the breath sounds are reduced bilaterally, the expiration is prolonged, and the heart sounds are distant. 3.Dry and wet rales are occasionally heard at the base of the lungs bilaterally in case of co-infection. In severe cases, cyanosis, swelling, and jugular vein anger signs may appear. 5.The presence of heartbeat under the raphe, which is significantly stronger than the apical part, suggests the complication of early pulmonary heart disease.