Heart failure is caused by various reasons leading to the heart's blood supply being relatively or absolutely insufficient, causing a series of pathological and physiological disorders in patients. Patients often manifest symptoms like difficulty breathing, tightness in breath, and even a feeling of suffocation. However, generally, the symptoms caused by heart failure are not these. This is because suffocation occurs due to airway narrowing or the narrow space around the patient, leading to insufficient oxygen intake, causing a series of syndromes. Therefore, although people with heart failure feel suffocated, they are not actually suffocating; it is just a manifestation of inadequate circulatory supply.