I'm 6 days in MtF and I noticed the veins in my arms don't pop anymore.

Does it happen this fast?

If you are taking Spiro...yes. It would be a sign that your blood pressure is lower now because of the Spiro.

If you aren't taking Spiro...its probably psychosomatic.

If you are on Spiro it could be dehydration. Not really enough information though.

Wow this forum moves fast.

Yes I'm taking spiro (conservative dose) and Progynova

With testosterone reducing and especially estrogen increasing, the veins do pop less and skin becomes more translucent, softer. This is normal.

Post-op, even when my testosterone levels were quite low, if estrogen was low, veins would protrude more. Immediately following increase in estrogen, they would protrude much less.