What causes an enlarged heart? What causes an enlarged heart, and why are people with enlarged heart more at risk with their health?

Many possibilities. Whenever the heart isn't functioning at full capacity, whether due to a bad valve, weakened muscle, scar from heart attack, prolonged and abnormal rhythms, etc, it enlarges to try to compensate for his incapacity. Other things being equal, the larger the heart, the shorter the life expectancy.
There . There are many causes of an enlarged heart, and the heart can enlarge in different ways. In some conditions, the heart chambers dilate and the heart muscle weakens. This dilation most often occurs as a consequence of prior heart attacks, which is called ischemic cardiomyopathy. It can also be caused by toxins such as excessive alcohol, genetic abnormalities, metabolic derangements such as thyroid disease or sometimes occurs with no apparent cause (idiopathic cardiomyopathy). In some other conditions, the heart muscle thickens excessively as opposed to dilating, and this also leads to an enlarged heart. The most common cause of a thick heart is untreated hypertension, but it can also be caused by a genetic condition called hypertrophic cardiomyopathy or can also occur when substances infiltrate and replace heart muscle. People with an enlarged heart are at increased risk for a few different reasons. If the heart muscle weakens, they can develop congestive heart failure which causes many symptoms and increases the risk of death. People with an enlarged heart are also at increased risk for arrhythmias, which in certain circumstances can cause cardiac arrest.