<unk> es are either confined to the heart or are part of a generalized systemic disorder, both often leading to cardiovascular death or progressive heart failure-related disability. Other diseases that cause heart muscle dysfunction are excluded, such as coronary artery disease, hypertension, or abnormalities of the heart valves. Often, the underlying cause remains unknown, but in many cases the cause may be identifiable. Alcoholism, for example, has been identified as a cause of dilated<unk> , as has drug toxicity, and certain infections (including Hepatitis C). Untreated celiac disease can cause<unk> es, which can completely reverse with a timely diagnosis. In addition to acquired causes, molecular biology and genetics have given rise to the recognition of various genetic causes. A more clinical categorization of<unk>  as 'hypertrophied', 'dilated', or 'restrictive', has become difficult to maintain because some of the conditions could fulfill more than one of those three categories at any particular stage of their development. The current American Heart Association (AHA) definition divides<unk> es into primary, which affect the heart alone, and secondary, which are the result of illness affecting other parts of the body. These categories are further broken down into subgroups which incorporate new genetic and molecular biology knowledge.
Cardiomyopathy
Dilated cardiomyopathy
Amyloid cardiomyopathy
Myopathy
Alcoholic cardiomyopathy
Cardiac amyloidosis
Arrhythmogenic cardiomyopathy
Diabetic cardiomyopathy