causes of heart blockage
Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Heart block) that could possibly cause Heart block includes: 1  Heart attack. 2  Coronary artery disease. 3  Sinus node disease. 4  Congenital heart defect. 5  Myocarditis. 6  Coronary thrombosis (see Heart symptoms) 7  Cardiomyopathy. 8  Heart valve disease.
Heart block typically causes lightheadedness, fainting, and palpitations. Depending on the severity of the heart block, this can be dangerous. For example, a third-degree heart block can worsen pre-existing conditions, such as heart failure. It can cause loss of consciousness and even sudden cardiac arrest. There can also be chest pain.