Enlarged heart – Symptoms and causes – Mayo Clinic

An enlarged heart can be caused by conditions that cause your heart to pump harder than usual or that damage your heart muscle. Sometimes the heart gets larger and becomes weak for unknown reasons. This is known as idiopathic cardiomegaly. A heart condition you’re born with (congenital), damage from a heart attack or an abnormal heartbeat …

https://www.mayoclinic.org/diseases-conditions/enlarged-heart/symptoms-causes/syc-20355436