Heart failure is a medical condition that occurs when the heart doesn't pump blood as well as it should. Certain other conditions can weaken the heart and diminish its ability to operate efficiently, but treatment can sometimes stop and even reverse the damage. The Heart Failure Society of America came up with the acronym FACES to help doctors and patients spot the symptoms of heart failure quickly and begin treatment. These heart failure symptoms don't confirm a diagnosis, but they are warning signs for getting a medical evaluation.
A person experiences fatigue when he or she is extremely tired all the time and has trouble doing normal activities, such as walking up the stairs and carrying groceries in from the car. In some cases, the fatigue keeps people from even doing very basic things like walk across the room or bend over to pick something up. When they attempt to perform these basic tasks, they quickly tire and become short of breath.
Fatigue is a sign of congestive heart failure that occurs because the heart is unable to pump oxygen-rich blood throughout the body. As a survival measure, the body diverts oxygen-rich blood from muscles and other organs to the heart and the brain.