Assuming you have non-European ancestry, where does that come from? I've read that Native Americans can show up as having East Asian and/or Central Asian genetic ancestry based on the fact that they originally migrated from Asia, however to the best of my knowledge there's no connection between Spaniards/Portuguese and Central Asia. If you said Italy/Greece (Romans in Spain, trade, geographic/cultural proximity, etc.) or North Africa (Moors in Spain) however, then it would be a safe assumption that that's tied in with your Spanish ancestry, but Central Asia? Safe bet that it's another part of your ancestry, but you never know.

Some studies have traced European Y chromosome DNA back to men who lived in Central Asia before they migrated west and became Europeans in the modern sense (as in before Europeans and East Asians diverged from one another after human groups left Africa, and Central Asia is still the area where the two overlap and blend into one another, so there's that too).