The main causes of diastolic dysfunction are insufficient blood supply to the heart muscle, aging, and high blood pressure. 1. Insufficient blood supply to the heart muscle: it will cause the left ventricular muscle function to be reduced, resulting in reduced diastolic function. 2. Ageing: With ageing, especially in the elderly, the diastolic function of the heart also decreases and degenerative changes ensue, causing local myocardial ischemia and resulting in reduced diastolic function. 3. Hypertension: Especially in patients with long-term poorly controlled hypertension, there will be a decrease in diastolic function of the heart. In severe cases, it may even lead to diastolic heart failure. There may be other reasons for hypodiastolic cardiac function, so you can go to the hospital to complete the relevant examinations to clarify the situation and take appropriate measures.