Early symptoms of pleural effusion include dyspnea, cough and chest pain or systemic symptoms such as fever. 1. Difficulty in breathing: when the amount of fluid is relatively small, patients may have symptoms such as mild dyspnea; if the amount of fluid is relatively large, there will be obvious symptoms of shortness of breath. 2. Cough and chest pain: patients often have cough and chest pain. When coughing or taking a deep breath, the symptoms of chest pain will be more serious. 3. Systemic symptoms: If the pleural effusion is caused by tuberculosis, it may be accompanied by fever; if the symptoms are caused by cardiac dysfunction, palpitations may also occur. When the symptoms of pleural effusion appear, you should consult a doctor in time and standardize the treatment under the guidance of a professional doctor to avoid delaying the condition.