Tricuspid insufficiency results when the tricuspid valve does not completely close, due to scarring, thickening, or malformation of the valve.

Causes of tricuspid insufficiency include:

• Rheumatic fever
• Endocarditis
• Birth defect:
• Abnormal formation of the tricuspid valve
• Carcinoid syndrome
• Injury
• Marfan syndrome
• Ehlers-Danlos syndrome