DefinitionMalignant hypertension is a sudden and rapid development of extremely high blood pressure. The lower (diastolic) blood pressure reading, which is normally around 80 mmHg, is often above 130 mmHg.Alternative NamesAccelerated hypertension; Arteriolar nephrosclerosis; Nephrosclerosis - arteriolar; Hypertension - malignant; High blood pressure - malignantCauses, incidence, and risk factorsThe disorder affects about 1% of people with high blood pressure, including both children and adults. It is more common in younger adults, especially African American men. It also occurs in women with toxemia of pregnancy, and persons with kidney disorders or collagen vascular disorders.You are at high risk for malignant hypertension if you have had kidney failure or renal hypertension caused by ren