eli5: how does heart failure cause fluid build up?

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My husband just spent 5 days in the hospital getting IV diaretics to remove fluid …lost 10 lbs. He has congestive heart failure. I know that the blood and ergo the oxygen is not flowing freely, by how does this cause fluid buildup and what IS the fluid. How is this different from fluid in lungs from pneumonia?

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When the heart isn’t working well, it can’t pump blood around the body properly. This can cause fluid to build up in different parts of the body, like the lungs or the feet. This is called edema and it can cause swelling, shortness of breath, and other symptoms. There are different ways to treat edema, like taking medicine or making lifestyle changes, depending on what’s causing it.

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