Fetal tricuspid regurgitation may be due to incomplete closure of the tricuspid valve, lesions of the tricuspid valve itself, or tricuspid regurgitation secondary to other diseases. Tricuspid regurgitation is the regurgitation of blood from the right ventricle into the right atrium, which can increase the load on the heart and impair its function. Tricuspid regurgitation may be caused by insufficient closure of the tricuspid valve due to dysplasia, or by lesions of the tricuspid valve itself, such as rheumatism, tricuspid valve prolapse, congenital structural anomalies, etc., or it may be caused by other diseases secondary to tricuspid regurgitation, such as left heart insufficiency and pulmonary hypertension. Fetal tricuspid regurgitation is more commonly associated with slower development of the valve, which can gradually improve as the fetus develops, and can be reviewed regularly to observe the development of the fetus’s heart, and if the heart is still not developing well, surgery or termination of pregnancy can be performed after birth.