Hypertrophic obstructive cardiomyopathy is a medical condition in which the heart muscle- the myocardium becomes abnormally thick, making it harder for the heart to pump blood. This condition often goes undiagnosed because very few people have it. Those who have can lead healthy lives with no significant problems. However, in some people, the thickened muscles cause breathlessness, chest pain, and problems in the electrical system of the heart leading to abnormal heart rhythms.
It is caused due by abnormal genes as those who have it have an abnormal arrangement of heart muscle cells called myofiber disarray. The severity of this condition is different from person to person. Also, sometimes, this condition occurs without significant blocking of the blood flow.