Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Cardiomyopathy means the heart muscle is sick—it might squeeze too weakly, get too thick, turn stiff, or fill with scar—and each type breaks the pump in a different way.
A Weakening Water Pump in a Home System
Imagine a home's water pump that pushes water through all the pipes—it's the engine of the whole system. In cardiomyopathy, the pump's motor (heart muscle) gets damaged: the chamber stretches and thins (dilated), the motor housing thickens and jams (hypertrophic), or the pipes harden and won't flex (restrictive). When the pump weakens or stiffens, water backs up into the basement (lungs fill with fluid) and the yard floods (legs swell), while the upstairs rooms run dry (brain and organs starve for blood). The system's regulator (nervous system) senses the problem and tries to fix it by speeding up the pump and holding more water in the tank—this works briefly, but then water pressure builds everywhere, the pump burns out faster, and eventually nothing flows right. The wrinkle: the faster spinning and water-holding that saved the system yesterday are the same things destroying it today.
AHA/ACC 2020 Guideline for the Diagnosis and Treatment of Cardiomyopathy · European Society of Cardiology (ESC) 2023 Cardiomyopathy Guidelines · American College of Cardiology (ACC) Expert Consensus · Cochrane Reviews on Heart Failure Management · reviewed 2026-07-07