Lub-dub Sound Of Heart Is Caused By May 2026

Contrary to popular belief, the “lub-dub” is the sound of the heart muscle contracting. Instead, it is an acoustic event caused by the turbulent closing of the heart valves .

Every time a doctor presses a stethoscope to your chest, they are listening for two specific sounds: “Lub... dub... lub... dub.” To the untrained ear, it’s a simple, rhythmic noise. But to a clinician, it’s a real-time report on the health of your heart’s valves. lub-dub sound of heart is caused by