Pleural effusion may be caused by tuberculosis, pneumonia, lung cancer and so on. Tuberculosis can be treated with anti-tuberculosis drugs such as isoniazid; patients with pneumonia are mainly treated with antibiotic drugs such as levofloxacin, and patients with lung cancer are often treated with chemotherapy and puncture aspiration. 1. Tuberculosis: patients with pleural effusion caused by tuberculosis should pay attention to rest, ensure sufficient nutrition, due to the high protein content of pleural effusion in tuberculous pleurisy, which is easy to cause pleural adhesion, the pleural effusion should be pumped out as soon as possible, and at the same time, anti-tuberculosis drugs such as isoniazid and rifampicin should be used in conjunction with the treatment. 2. Pneumonia: the amount of pleural effusion caused by pneumonia is generally small, and it is usually treated with antibiotics such as ceftriaxone and ofloxacin, which can be absorbed after antibiotic treatment, and those with much effusion can be treated with pleural puncture to draw out the fluid or intercostal intubation to drain the fluid. 3. Lung cancer: pleural effusion is mostly a complication of advanced lung cancer, and systemic chemotherapy has certain efficacy. Due to the rapid growth of cancerous pleural effusion, repeated thoracentesis and aspiration are often needed, and chemical pleural fixation is also feasible, and anti-tumor drugs such as bleomycin and cisplatin can be injected into the thoracic cavity. Patients with pleural effusion should go to the hospital in a timely manner, complete the examination, and then give targeted treatment after clarifying the cause of the disease.