Congestive heart failure occurs when the heart cannot pump enough blood to meet the body's needs, causing fluid buildup in the lungs and legs. It can be caused by conditions like coronary heart disease, heart attacks, high blood pressure, and diabetes that damage the heart. Common symptoms include shortness of breath, fatigue, swelling of the ankles and abdomen, and confusion. Tracking symptoms such as breathlessness, heart rate, weight, swelling, and blood pressure can help patients and doctors monitor the condition and make lifestyle adjustments to improve health outcomes.