.Congestive heart failure results from fluid building up in your body, most problematic your chest. Too much and it becomes difficult for the heart to pump. Too much I'm told it can stop your heart. Also your lungs can't function efficiently, if at all. Read about renin- angiotensin-aldersterone system. It is the kidneys regulating your fluids to keep everything where it thinks it should be. Search on line. I sat in on a great seminar once online. I suffer from CHF for many years. I stopped breathing in the ER in 2011. Treatment creates other problems.