HDL cholesterol of 0.83 mmol/L is not normal. The normal value of HDL cholesterol is 1.04-1.55mmol/L. Below normal values are mostly characterized by hypoHDLemia. The function of HDL is to lower the level of plasma cholesterol in the human body. If the value of HDL cholesterol is lower than normal, it will contribute to the increase of plasma cholesterol level, which is a danger signal for the occurrence and progression of atherosclerosis. If the patient has HDL cholesterol 0.83mmol/L, in daily life, he/she should pay attention to controlling the blood lipid level, try to eat more vegetables, increase exercise, and if necessary, he/she can follow the doctor’s prescription to apply drugs such as atorvastatin calcium, lovastatin, and so on for treatment. HDL patients should go to the hospital in time, refer to other indicators of the body to comprehensively assess the condition, under the guidance of a professional physician for treatment, and avoid self-medication.