Think of your arteries as busy highways that carry oxygen-rich blood from your heart to the rest of your body. For everything to run smoothly, these roads need to be clear. Atherosclerosis is what happens when these highways get clogged up. It's a gradual process where a sticky substance called plaque builds up on the inner walls of your arteries.

As more plaque accumulates, the arteries can become narrow and stiff. This makes it harder for blood to flow through. Over many years, this reduced blood flow can lead to serious problems like heart attacks and strokes, depending on which arteries are affected.

Plaque buildup doesn't happen overnight. It starts when the inner lining of an artery, called the endothelium, gets damaged. This damage can be caused by several factors, creating a rough spot where sticky materials can latch on.

Once the lining is damaged, your body's repair process kicks in. Immune cells and other substances rush to the site. This process is supposed to heal the artery, but sometimes it goes into overdrive. Cholesterol, particularly a type known as low-density lipoprotein (LDL) or "bad cholesterol," can get trapped at the injury site. Over time, this mixture of cholesterol, cells, and other debris hardens into plaque.

This creates a vicious cycle. The plaque itself causes inflammation, which attracts more immune cells and leads to even more plaque. The buildup grows slowly, often over decades, narrowing the artery bit by bit.

While atherosclerosis can affect anyone, certain factors significantly increase your risk of developing it. These factors often work together, speeding up the damage and plaque buildup in your arteries.

Managing these risk factors is the most effective way to slow down the progression of atherosclerosis and protect your circulatory system. Understanding what causes the condition is the first step toward prevention.