Congestive Heart Failure (CHF), or just Heart Failure, is where the heart is no longer able to effectively pump blood around the body. In heart failure the heart is weak, and so blood passes much slowly around the body, this results in organs not being properly supplied with blood and for the pressure inside the heart to increase. When this happens the walls of the heart may stretch to hold more blood or they may become thicker due to the increased pressure. Blood becomes backed up in the veins of the body and the kidneys retain water and salt causing swelling in the feet, legs and for fluid to build in the lungs- this backing up of fluid is where the term congested comes from.
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