Whether pericardial effusion requires control of water intake depends on the cause of the pericardial effusion, as there are many reasons for it, such as heart failure, tuberculous pericarditis, tumors, and hypoproteinemia. Pericardial effusion caused by heart failure requires water intake restriction, as excessive drinking can aggravate the symptoms of heart failure. However, for pericardial effusion caused by tuberculosis or tumors, water intake does not significantly affect the pericardial effusion, so there is no need to deliberately control water consumption. Patients with pericardial effusion should quit smoking and avoid alcohol in their daily lives, as smoking and drinking can exacerbate the symptoms of pericardial effusion. Additionally, patients should not overexert themselves.