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. It is essential for building cells, but too much can cause fatty deposits in blood vessels, increasing the risk of heart disease and stroke. 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 overall cardiovascular health. Regular check-ups can help monitor cholesterol levels.