The aim of our study was to correlate "medium" dyslipidemias with cardio-vascular diseases, especially essential hypertension (EHT). We selected 488 cases using randomization, from a population of hypertensive people. About 210 cases benefited by lipidograms and risk assessment, using special diagrams. When cholesterol was 200-250 mg/dl, 72% of cases had EHT and over 300 mg/dl, 57% had EHT. Comparing LDL chol with EHT, we obtained that arterial tension over 160 mmHg is correlated with LDL over 190 mg/dl on 12%, when LDL was less than 190 mg/dl but more than 150 mg/dl, we found EHT on 16% cases. EHT was very strong correlated with HDL < 40 mg/dl, 88%. On 5% of cases the only one dyslipidemia was marked by low HDL chol and all this cases had EHT. A particular risk was represented by the dyslipidemia with low HDL chol and high triglycerides (28% of cases). We concluded that the highest prevalence was for medium hypercholesterolemia with/or low HDL chol and, the same time, extreme values had comparable prevalences with medium values.