0:00:03.668,0:00:07.209
Heart sounds that are soft and difficult to hear

0:00:07.209,0:00:08.916
are most common when there is something

0:00:08.916,0:00:11.497
between the heart and the stethoscope.

0:00:11.497,0:00:13.268
Common causes include

0:00:13.268,0:00:16.873
pericardial effusion (fluid surrounding the heart),

0:00:16.873,0:00:21.652
pleural effusion (fluid present in the thoracic cavity around the lungs),

0:00:21.652,0:00:23.572
and obesity.