Heart Failure Support Group
Heart failure is a condition that can result from any structural or functional cardiac disorder that impairs the ability of the heart to fill with or pump a sufficient amount of blood throughout the body. It is often undiagnosed due to a lack of a universally agreed definition and difficulties in diagnosis, particularly when the condition is considered "mild."
Again, I recommend a great read: http://www.mensjournal.com/health-fitness/health/heal-thyself-taking-a-fatal-diagnosis-into-his-own-hands-20141128