Difficulty breathing is one of the most common symptoms of congestive heart failure, often presenting as dyspnea or shortness of breath. The symptom may be most noticeable when lying down, first waking up, or during exercise. This can occur because the heart has difficulty pumping blood to the organs or because fluid is already accumulating in the lungs. In more severe cases, this symptom can develop in conjunction with coughing up pink, foamy mucus.
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