Pleural effusion is usually a serious disease, and its symptoms can have serious adverse effects on the life of the patient. Most of the pleural effusions are associated with other underlying diseases, which can also originate from the lungs and pleura, or from extra-pulmonary diseases such as cardiovascular and renal diseases, so detailed history taking and observation of the patient’s symptoms can be of great importance for the diagnosis of the cause of pleural effusions. What are the clinical manifestations of pleural effusion? 1, cough, chest pain, often dry cough, accompanied by chest tingling, chest pain increases when coughing or deep breathing. 2, dyspnea, the disease symptoms are not obvious in the case of a small amount of effusion, or slightly feel chest tightness; when a large amount of effusion exists, you will feel obvious dyspnea, and the chest pain can be slowed down at this time. 3.Systemic symptoms, depending on the cause of pleural effusion. 4, signs, a small amount of effusion can have pleural friction sounds, typical signs of effusion on the affected side of the thorax is full, respiratory movement is reduced, percussion turbid sounds, fibrillation and breath sounds are reduced or disappeared, medium amount of effusion in the upper edge of the percussion turbid boundary can sometimes be heard bronchial breath sounds, the trachea will be displaced to the healthy side when the effusion is large. If the patient has a small amount of pleural effusion, the signs are not obvious; in the case of a medium amount of effusion, the affected side of the chest is full, the rib space is widened, the respiratory movement is weakened, the fibrillation is weakened or disappeared, turbid sounds are heard on percussion, and the breath sounds are weakened or disappeared on auscultation; the lung above the effusion is compressed, the air content is reduced, and amniotic sounds and bronchoalveolar breath sounds can be heard; in the case of a large amount of pleural effusion, in addition to the above signs, the mediastinum is shifted to the In addition to the above signs, the mediastinum is shifted to the healthy side and the trachea is displaced.