Pericardial effusion is a relatively common clinical phenomenon, and a small amount of pericardial effusion is likely to heal spontaneously. The normal human pericardial cavity usually contains about 25-30 ml of fluid, which can serve as a lubricant to some extent. If the pericardial effusion is caused by inflammatory exudation, resulting from infection of the myocardium or pericardium by pathogenic microorganisms such as bacteria, viruses, Mycobacterium tuberculosis, etc., a small amount of pericardial effusion with mild symptoms may heal spontaneously, but severe cases require antibiotics and other medications to control the infection. Small amounts of pericardial effusion caused by cardiac insufficiency, rheumatic heart disease, tumors, endocrine diseases and other diseases generally do not heal on their own and require appropriate treatment to get better. Patients with a small amount of pericardial effusion without underlying diseases and uncomfortable symptoms generally do not need to be treated, but if the patient has tuberculosis, hypoproteinemia, tumors and other diseases, he or she should promptly visit the cardiology department of a regular hospital.