Cardiomyopathy is a group of diseases affecting the heart muscle, leading to difficulties in pumping blood; common types include dilated, hypertrophic, restrictive, and arrhythmogenic cardiomyopathy. Risk factors can be modifiable, such as lifestyle choices, and nonmodifiable, like family history. Diagnosis involves various tests, and management may include medications, lifestyle changes, and in severe cases, surgery or heart transplant.