If you hear something other than a clear "lub-dub," it may indicate an issue:
The "lub-dub" sound is an essential part of our bodily rhythms, and it's a reminder of the incredible work our hearts do every day! heart lub dub sound
The sound isn't the valves hitting each other, but rather the of blood and the heart walls when the valves snap shut. If you hear something other than a clear
The first heart sound, the "lub," is technically known as . It is typically a lower-pitched, slightly longer sound that marks the beginning of systole , the phase when the heart's lower chambers (ventricles) contract. How the Heart Works - How the Heart Beats | NHLBI, NIH heart lub dub sound