Fluid in the lungs, known as pulmonary edema. This condition occurs when the tissue and air sacs in the lungs, which are supposed to contain air, are actually filled with fluid. Of course the emergence of fluid in the lungs can not be considered trivial, because it can make sufferers have difficulty breathing. If left without proper treatment, this condition may be fatal. Understanding the Causes of Fluid in the Lungs The cause of the emergence of fluid in the lungs can be divided into two groups, namely cardiogenic (causes originating from the heart) and noncardiogenic (causes that do not originate from the heart). Some cardiogenic conditions that can cause pulmonary edema are: Uncontrolled or untreated high blood pressure (hypertension). Damage to the heart muscle that causes weakness in heart function (cardiomyopathy). Stiffness, leakage, weakness, or damage to the heart valves. Coronary heart disease. Without proper treatment, the conditions above can cause more severe