The life expectancy of patients with pleural effusion caused by tuberculosis or infection is no different from that of normal people after active treatment. If patients with pleural effusion caused by advanced cancer, malignant tumors, etc., their life expectancy is usually two to three months. Pleural effusion is an excess of pathologic fluid in the pleural cavity. If it is caused by common infection, it can be cured in about one month after sensitive antibiotic treatment, while tuberculosis requires more than half a year to be cured after early, regular, whole course, appropriate amount and combined anti-tuberculosis treatment, and the life expectancy after cured is no different from that of normal people. However, if the pleural effusion is caused by advanced cancer, malignant tumor, etc., the basic condition of the patient is very poor, and there will be some effect through intra-thoracic injection of drugs, closed chest drainage, etc., but the effect may not be too satisfactory. The life expectancy is usually just two to three months. It is recommended that patients with pleural effusion should go to the hospital in time to clarify the cause of the disease and take personalized treatment by professional physicians in order to achieve better results.