The length of hospitalization for patients with pleural effusion depends on their specific conditions and should be analyzed on a case-by-case basis, not as a generalization. There are many clinical causes of pleural effusion, and the length of hospitalization depends on the treatment of the original disease. If the pleural effusion is caused by tuberculosis, the effect of anti-tuberculosis treatment is obvious, and most patients can be controlled within 2-3 weeks and discharged in 3-4 weeks, but after discharge, they still need to follow the medical prescription for anti-tuberculosis treatment for at least six months. If the pleural effusion is caused by infection and the patient’s anti-infection treatment is more satisfactory, together with thoracentesis drainage, it can usually be controlled within 1-2 weeks and can be discharged within 2-3 weeks. If it is caused by cardiac insufficiency, nephrotic syndrome, systemic lupus erythematosus, malignant tumor, etc., the length of hospitalization depends on the treatment of these diseases. Patients are advised to visit the thoracic surgery department of the hospital in a timely manner, perform thoracentesis laboratory tests to clarify the pathological causes, and take appropriate treatment after being judged by a professional physician.