Damage to the arteries

Healthy arteries are flexible, strong and elastic. Their inner lining is smooth so that blood flows freely, supplying vital organs and tissues with nutrients and oxygen.

Over time, high blood pressure increases the pressure of blood flowing through the arteries. This may cause:

• Damaged and narrowed arteries. High blood pressure can damage the cells of the arteries' inner lining. When fats from food enter the bloodstream, they can collect in the damaged arteries. In time, the artery walls become less elastic. This limits blood flow throughout the body.
• Aneurysm. Over time, the constant pressure of blood moving through a weakened artery can cause part of the artery wall to bulge. This is called an aneurysm. An aneurysm can burst open and cause life-threatening bleeding inside the body. Aneurysms can form in any artery. But they're most common in the body's largest artery, called the aorta.