Loeffler’s endocarditis is a rare restrictive cardiomyopathy caused by abnormal endomyocardial infiltration of eosinophils, with subsequent tissue damage from degranulation, eventually leading to fibrosis. We present a unique case of a woman who presented with signs and symptoms of heart failure was found to have hypereosinophilia and restrictive cardiomyopathy diagnosed with Loeffler’s endocarditis. high–dose corticosteroids were used to reverse the cardiac injury and to improve the clinical outcome.