Does a tourniquet stop veins from rolling?

A tourniquet is usually applied to the upper arm to create venous obstruction and cause the veins to become engorged and more visible, making them easier to access for procedures such as venipuncture or intravenous therapy. By impeding venous return, a tourniquet allows for easier visualisation and palpation of veins. However, it is essential to release the tourniquet promptly after the procedure to avoid potential complications associated with prolonged venous occlusion.