If a patient has a diastolic blood pressure of 56 mmHg, this is abnormal and is considered hypotension. Hypotension is defined as diastolic blood pressure less than 60 mmHg or systolic blood pressure less than 90 mmHg. If the diastolic blood pressure is too low, it can affect the blood perfusion of various organs, and some patients can experience abnormalities such as chest tightness, chest pain, and dizziness. The current definition of hypertension is a range of systolic blood pressure ≥ 140mmHg and diastolic blood pressure ≥ 90mmHg. So if a patient has a low pressure of about 56mmHg, it is important to further identify the cause of making the diastolic blood pressure too low, whether it is due to overdose of antihypertensive drugs or due to congenital hereditary reasons, diastolic blood pressure is naturally that low.