Pericardial effusion is a type of cardiovascular disease, and if it is severe, it can cause chest pain. This is primarily due to changes in heart function, with patients mainly experiencing symptoms such as palpitations, chest tightness, and difficulty breathing. If chest pain occurs, it indicates that the symptoms are very severe, and it is recommended to seek active treatment at a hospital, using medications to control heart failure or performing fluid extraction for examination. For the treatment of pericardial effusion, percutaneous fluid drainage can be chosen, which can also alleviate the patient’s condition. Generally, chest pain could also be caused by pericardial effusion. During this period, it's important to monitor changes in the patient's blood pressure, heart rate, and pulse. If blood pressure is too high or heart rate is too fast, it needs to be addressed.