Many people really feel small stinging or cramping when the needle goes in to the vein. Tell your healthcare professional if it hurts quite a bit. Pain might outcome from the answer leaking from your vein into your tissue all-around it. You should not pressure. Straining and holding your breath https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/