The correct name for low blood pressure should be diastolic blood pressure. A diastolic blood pressure of 140mmHg is more serious and may cause a series of heart, brain and kidney complications, which can be life-threatening in severe cases. A diastolic blood pressure of 140mmHg, according to the blood pressure classification and standards currently used in China, is classified as grade 3 hypertension (severe), regardless of the systolic blood pressure. Long-term high blood pressure may lead to hypertensive heart disease, long-term high blood pressure can also make the cerebral blood vessel ischemia and degeneration, the formation of micro-aneurysms, rupture can cause cerebral hemorrhage, high blood pressure can also promote cerebral arterial atherosclerosis, atheromatous plaque rupture can be complicated by the formation of cerebral thrombosis, cerebral hemorrhage and cerebral thrombosis can be life-threatening; long-term high blood pressure can also lead to chronic renal failure, etc, and the prognosis is poorer. Diastolic blood pressure of 140mmHg is more serious, should be taken seriously, go to the hospital in time for scientific and standardized antihypertensive treatment, to reduce the occurrence of complications.