The most common cause of heart failure is infection, with respiratory infections being the most common. Other triggers include the following: 1. Arrhythmia is also a common cause of heart failure, with atrial fibrillation being the most common trigger for heart failure; 2. Overexertion and emotional excitement can easily cause an increase in heart load, which is also a trigger for heart failure; 3. Poorly controlled blood pressure or a sudden rise in blood pressure can also trigger heart failure; 4. Too rapid an infusion can lead to an increase in the burden on the patient’s heart, thus causing heart failure.