Pericardial effusion refers to the abnormal accumulation of fluid in the pericardial sac, the double-walled sac that surrounds the heart. This condition can result from various causes, including infections, inflammation, trauma, or underlying medical conditions. As the fluid accumulates, it puts pressure on the heart, potentially impacting its ability to function optimally. Common symptoms of pericardial effusion include chest pain, shortness of breath, and fatigue. Diagnosis often involves imaging tests such as echocardiography, and treatment may vary based on the underlying cause. In some cases, medical intervention, such as drainage of the fluid or anti-inflammatory medications, may be necessary to alleviate symptoms and prevent complications. Pericardial effusion underscores the importance of timely medical attention and intervention in managing cardiovascular health.