Hypertrophic cardiomyopathy (HCM) is a heart condition that causes abnormal thickening of the heart muscle, making it harder for the heart to pump blood effectively. Here’s what else you need to know about HCM. #webmd #hearthealth #cardiology #hypertrophiccardiomyopathy #geneticheartdisease #heartconditions #healtheducation #consumerhealth