There are two main types of cholesterol that are carried by different types of lipoproteins. Low-density lipoproteins (LDL) are sometimes called “bad” cholesterol. High levels of LDL cholesterol can build up in your arteries, causing heart disease. High-density lipoproteins (HDL) are referred to as “good” cholesterol.HDL cholesterol carries cholesterol from other parts of your body back to the liver.igh levels of LDL cholesterol can build up in your arteries, causing heart disease. High-density lipoproteins (HDL) are referred to as “good” cholesterol. HDL cholesterol carries cholesterol from other parts of your body back to the liver.