Q: I am a 25-year-old female, and I have spider veins and visible reticular veins behind knees. My ultrasound is normal. I have had chronic constipation for 10 years. Could it be the reason?
A: Anything that increase intra-abdominal pressure could cause more reflux in an already incompetent vein. Make sure that you had an ultrasound specifically looking for venous insufficiency and not a standard venous duplex scan that typically looks for clots.