Drinking excessive amounts of alcohol causes raised blood pressure which is one of the most important risk factors for having a heart attack or a stroke. Increases in your blood pressure can also be caused by weight gain from excessive drinking.
Consuming too much alcohol raises the level of triglycerides in your blood which will create high blood pressure. With the increase of fats and blood pressure, your heart has to work harder to pump the blood to the rest of your body, creating a strain on the heart and eventually leading to cardiomyopathy or heart attack.
While there have been multiple studies stating that having one or two drinks a day, especially of red wine, can reduce your risk of heart disease, many forget that there is a point in which it goes from being beneficial and becomes dangerous to your health.