Causes

It may be difficult to determine the cause of dilated cardiomyopathy. The condition often runs in families (is inherited). However, many things can cause the left ventricle to dilate and weaken, including:

• Diabetes
• Obesity
• Heart rhythm problems (arrhythmias)
• High blood pressure (hypertension)
• Complications of late-stage pregnancy
• Excessive iron in your heart and other organs (hemochromatosis)
• Certain infections

Other possible causes of dilated cardiomyopathy include:

• Alcohol abuse
• Use of certain cancer medications
• Use of illegal drugs, such as cocaine or amphetamines
• Exposure to toxins, such as lead, mercury and cobalt