Hyperlipidemia is an abnormally elevated level of lipids in the blood and is a major risk factor for coronary heart disease. It can be caused by lifestyle factors like poor diet and lack of exercise or genetic defects. Treatment involves therapeutic lifestyle changes as well as drug therapy to lower cholesterol levels and reduce the risk of cardiovascular events and death. Statins are the first-line treatment as they significantly reduce low-density lipoproteins, while other drugs like niacin, fibrates, and cholesterol absorption inhibitors are also used either alone or in combination with statins.