Fluid accumulation in the lungs may be caused by cardiac insufficiency, bacterial pleurisy, tuberculosis pleurisy, lung cancer and other diseases, which should be treated accordingly with specific conditions, such as diuretic treatment, anti-infection treatment, anti-tuberculosis treatment, anti-tumor treatment and so on. 1. Cardiac insufficiency, which can lead to chest tightness, dyspnea, may be accompanied by pulmonary edema and pleural effusion, most of them need to be treated with diuretics such as furosemide, spironolactone, etc., and may also need to use other drugs, such as nitroglycerin to dilate blood vessels. 2. Bacterial pleurisy, bacterial pleurisy can lead to pleural effusion, and even cause pus chest, need to use sensitive antibiotics, such as penicillin combined with metronidazole, and often also need to chest tube drainage treatment. 3. Tuberculous pleurisy, which can cause pleural fluid, may be accompanied by fever, chest pain and other symptoms, often need to use rifampicin, isoniazid and other anti-tuberculosis drugs for treatment, and may also need to be intermittent extraction of pleural fluid treatment. 4. Lung cancer and other malignant tumors, malignant tumors can lead to pleural effusion, also known as malignant pleural effusion, may require the use of chemotherapeutic drugs, such as non-small-cell lung cancer and accompanied by driver gene mutation, can be treated with targeted drugs, such as gefitinib. Therefore, fluid in the lungs, need to seek timely medical treatment, targeted treatment. Drugs need to be used under the guidance of doctors, avoid self-medication.