If the amount of pericardial effusion is small in the early stage, the pericardial fricative sound may be heard due to the increase of fibrin. The pericardial fricative sound may be slightly relieved in the anterior tilt position and aggravated in the lying position. After the occurrence of pericardial effusion, in addition to distant heart sounds and pericardial fricative sounds, liver enlargement and lower limb edema due to jugular vein anger and body circulation stasis may also occur. Some patients may experience pain in the precordial region in the early stage, and a large number of pericardial effusions may result in a drop in blood pressure or even loss of consciousness due to cardiac compression.