This question is a bit misleading, as there is no such thing as good or bad cholesterol. The term refers to the two types of transport molecules (high-density lipoprotein, low-density lipoprotein) that are responsible for transporting cholesterol through the bloodstream. It is believed that the high-density lipoprotein (HDL) can remove cholesterol from arteries. Hence, HDL is sometimes referred to as "good cholesterol". On the other hand, high levels of low-density lipoprotein may indicate medical problems associated with cardiovascular disease. Hence, LDL-cholesterol is sometimes referred to as "bad cholesterol".