Lung effusion in the elderly can be seen in lung inflammation, lung cancer, hypoproteinemia, etc., and should be treated for the cause, mainly medication, surgical treatment, life interventions, the use of drugs in accordance with medical advice. 1. Severe pneumonia in the elderly can cause inflammatory exudation in the lungs, resulting in pleural effusion. The main treatment is medication to actively control the infection, such as cefoperazone sulbactam. If the pleural effusion is caused by tuberculosis bacillus should be actively anti-tuberculosis treatment, such as the use of isoniazid, rifampicin and so on. If the amount of pleural effusion is large enough to affect breathing, thoracentesis can be used to drain the effusion. 2. Lung tumor metastasis involving the pleura or obstruction of pulmonary lymphatic reflux can cause pleural effusion, and surgical resection of the tumor and drainage of pleural effusion are feasible for treatment. 3. severe malnutrition, hypoproteinemia, effective osmotic pressure decreases, easy to appear tissue edema and plasma membrane cavity effusion, the treatment is mainly exogenous supplementation of albumin, if the amount of effusion can be puncture drainage. Healthy diet in daily life, eat more green vegetables, eggs, milk, meat. Pleural effusion is a pathologic change, and it is recommended that patients seek timely medical treatment so as not to delay their condition.