Some people really feel insignificant stinging or cramping in the event the needle goes into your vein. Tell your healthcare Experienced if it hurts quite a bit. Pain could result from the solution leaking in the vein in to the tissue all-around it. A blood clot, also known as thrombosis. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/