MEDICAL PHYSIOLOGY

Detailed explanation-1: -The main cause is atherosclerosis, which is the build-up of fatty deposits that narrow a blood vessel, usually an artery. The narrowed blood vessel reduces the circulation of blood to the associated body part. Peripheral vascular disease mainly affects blood vessels of the legs and kidneys and, less commonly, the arms.

Detailed explanation-2: -There are several reasons for veins to appear to shrink, and not all of them lead to the need for any kind of vein treatment. In fact, most of the issue do not require treatment at all. Common reasons for veins appearing smaller are age, weight gain, and loss of muscle tone.