My veins in my hands have recently starting bulging often since tapering klonopin. i have high blood pressure spikes but even when my blood pressure is normal the veins still bulge. what could be the cause?

Bulging veins are a usual variation on the normal and not a cause for concern. Wish you good health!

Your venous press has risen due to congestive heart failure due to HBP/CHF/kidney failure, but you need to be certain you are looking a veins when your hand is at heart level-center of rib cage when seated. One way to test is to raise one hand above head straight in air & other straight down at side. For 1 min. They put your arms out in front. If up-hand veins not smaller see Dr.