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.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.