The jugular venous reflux sign, also known as hepatic jugular reflux, is used clinically to examine the degree of jugular venous irritation due to right heart failure such as hepatomegaly and stasis, and to determine the involvement of the right heart system and function. The clinical examination is performed by asking the patient to lie on one side of the bed with the head resting on one side, breathing calmly, and the palm of the examiner’s right hand pressed against the right epigastric region of the liver, gradually applying pressure for at least ten seconds, while observing the degree of jugular vein anger. Normally, the jugular vein is not dilated or temporarily dilated, but it rapidly decreases to a normal level, but in patients with right heart failure, the jugular vein is continuously and significantly inflamed, even after stopping compression of the hepatic area, and some patients have 1-2 seconds of inflammation, which we call a positive jugular reflux sign. The jugular venous reflux sign is an important sign of early right heart insufficiency, pulmonary hypertension, and pericardial effusion. The mechanism is mainly due to compression of the stagnant liver, which increases the amount of blood returning to the heart, resulting in a forced rise in pressure in the jugular vein, hence the name hepatic jugular reflux sign.