Lub-dub Sounds May 2026

Let’s pull back the curtain on the human body’s most important soundtrack. In simple terms, the "lub-dub" is the sound of your heart valves snapping shut.

"The squeeze is starting. No blood is allowed back into the top rooms." Breaking Down the "Dub" (S2) The second sound, "Dub" (clinically known as S2 ), marks the end of systole and the beginning of rest (diastole). lub-dub sounds

Thump-thump. Thump-thump.