Continual venous insufficiency (CVI) transpires Once your leg veins turn out to be weakened and will’t function as they should. Normally, valves with your leg veins continue to keep blood flowing back up to your heart. Pregnancy. For the duration of pregnancy, the blood volume in the body will increase. https://eduardohifdz.wikitelevisions.com/7609054/little_known_facts_about_vein_disease_treatment