Heart hypertrophy is a condition where the muscular wall of the heart becomes thickened. The heart wall is a muscle. It can thicken as a result of high blood pressure do to the heart having to pump against a higher blood pressure or it can thicken due to valvular problems especially when the aortic valve is narrowed. The heart can also thicken for unknown reasons which is termed hypertrophic cardiomyopathy. This is also called IHSS and is a common cause for sudden death in young people.