High cholesterol refers to an excess of cholesterol in the blood, which can lead to health issues. Cholesterol is a waxy substance produced by the liver and found in certain foods. While the body needs some cholesterol to function properly, too much can increase the risk of heart disease and stroke by forming plaques in the arteries. There are two main types of cholesterol: LDL (low-density lipoprotein), often called "bad" cholesterol, and HDL (high-density lipoprotein), known as "good" cholesterol. Maintaining a healthy balance between these types is crucial for cardiovascular health. Regular check-ups can help monitor cholesterol levels.