Pericardial effusion is generally not closely related to pneumonia. The common causes of pericardial effusion mainly include tuberculous pericarditis, as well as factors such as tumors, heart failure, and hypoproteinemia. The onset of pulmonary inflammation primarily affects the lungs, with symptoms often manifesting as cough and yellowish sputum. Some patients may also experience pleural effusion. Pulmonary CT scans typically show inflammatory exudative changes. If the pericardial effusion is minor, it is usually not a significant issue, but proper medical examination is necessary to rule out causes like tuberculosis or tumors that could lead to pericardial effusion.