Structural defects: Defects from the composition of the blood vessel can cause narrowing. Many of these are acquired at birth, and the trigger is unfamiliar. Structural abnormalities: Occasionally irregularities within the blood vessel anatomy can cause narrowing, contributing to PVD. Difficulties With all the valves inside your veins can result https://www.sgvascularctr.com/types-of-treatments-for-vascular-diseases/