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Signs and Symptoms

When symptoms occur, they often start during times of labor and effort and include:

  • Shortness of breath
  • Chest pain (angina)
  • Passing out (syncope)
  • Fatigue (feeling tired)
  • Reduced ability to exercise or be active
  • Sudden death

Once symptoms begin, they often get worse. If not diagnosed and treated, they can cause severe heart problems.

Over time, if the heart muscle gets very weak and there is heart failure, symptoms can also include swelling in the ankles, shortness of breath with exertion and when resting, and an inability to lie flat.