Not sure where this is going, but yes and enlarged heart is dangerous. This means there is usually an underlying condition that has caused the heart to work too hard which has caused the muscle (the heart is just a muscle) to enlarge as it tries to meet the body's demand for oxygen.
It is very important that the underlying condition is identified and resolved to help the heart remodel itself closer to normal.
If your posting this question to the forum means that you're not taking seriously this condition, as erijon says, this is a delicate cardiac state and has to be attended immediately cause could bring dangerous consequences. Normally you get this condition by two means which are: Genetic or by exposing your system to some overworking stress like taking drugs or an gaining a lot of weight. This is something that is has to be monitored constantly by your cardiologist, I advice you to NOT WAIT and go to see an specialist cause you might be in risk of any heart attack or really high levels of blood pressure (hypertension) which can bring you to a brain seizure. This doesn't mean that this is going to happen to you now, but it could if you don't give to your condition some special care and attention.
If the heart is 'sick' this can be dangerous if not being followed. However, if you are an athlete you can have an enlarged heart which would not be an issue. Like all muscles of the body, the heart can enlarge under those circumstances.
QUOTE: "is an enlarge heart serious, do it have an advantage or disadvantage than normal heart size?"
>>>>>>>Athlete's Heart. There is a non-pathological increase in heart size (remodeling) and there is reverse remodeling if and when the extreme activity ceases....the heart enlarges through (extreme) physical training (aerobic exercise, especially endurance sports) and the resting pulse lowers. Sometimes the heart enlarges as Jon states due to high blood pressure and the heart remodels to compensate. Treating the underlying cause can prevent further progression and may reverse remodeling.
Patholgically enlarged heart has damaged sarcomere heart tissues (specialized cells that can stretch and contract). This disease can be congenital, idiopathic (cause unknown), drugs, medication, etc.
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