What is the medical term for the thickening of the vessel wall?

The term "arteriosclerosis" refers specifically to the thickening and hardening of the walls of the arteries, which can occur due to various factors, including aging, high blood pressure, and the accumulation of fats. This condition impacts blood circulation and can lead to more serious cardiovascular issues.

Atherosclerosis, while similar, specifically involves the build-up of fats, cholesterol, and other substances in and on the artery walls, which can lead to blockages. Phlebitis is the inflammation of a vein, often associated with blood clots, and stenosis refers to the narrowing of blood vessels or heart valves. However, arteriosclerosis encompasses the broader phenomenon of vessel wall thickening, making it the accurate choice for this question.