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What causes Cardiomyopathy?

In many cases, the exact cause is not known. Possible causes include:

The cause of the initial damage is often not found, but may include:

Ischemic heart disease with decreased blood flow to the heart
Infections, usually viral
Chronic exposure to toxins, including alcohol and some chemotherapy drugs
A rare complication of pregnancy or childbirth (probably immune-related)
Rarely, other illnesses, including rheumatoid arthritis , diabetes, or thyroid disease

Causes may include:

This is usually related to another condition, such as:

Next: Risk factors for Cardiomyopathy