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What causes heart failure?

Any problem that makes your heart weak or stiff can cause heart failure. Common examples of such problems are:
Other problems that can cause heart failure are an irregular heart rhythm, low number of red blood cells (anemia), thyroid gland problems, and heart muscle infections.
Most disorders cause heart failure only after many years. However, some disorders, such as a major heart attack, can cause heart failure quickly.

Often, a person’s heart failure has more than one cause.

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