Hypocholesterolemia is the presence of abnormally low (hypo-) levels of cholesterol in the blood (-emia). While hypercholesterolemia, the presence of high cholesterol, has been linked strongly with cardiovascular disease, it's much less certain whether low cholesterol levels are intrinsically harmful. Classification According to most authorities, only total cholesterol levels below 160 mg/dL or 4.1 mmol/l are to be classified as "hypocholesterolemia". Causes Possible causes of low cholesterol ar… (More on Hypocholesterolemia)