I have a level 23 rogue. I just started the game. I recently bought an armor off of the marketplace with 22 vitality on it, hoping it would grant me some survivability in the Catacombs. However, when I equipped the armor, my health did not increase at all. Does vitality only work on warriors or something? I put my first stats into vit when I first started and my health was increased by every stat.

When I equip the armor, my Vitality stat does go up 22 points, but as I said, no health increase.

Thank you for any help.

Vitality on items increases the defense (either magic or physical) shown on the said armor.
Adding stats into Vitality gives you life, however.

vitality on gear doesnt give you life, it adds to your defense. a better way to add real defense is shoot for enhanced effect on armors.

typically armors that arent robes., scales > leathers > chains.

To get more hp you can

Get gear with max life
add points into your vitality stat best to do at early levels for more hp down the road

vit on gear will not add to your life

hope this helps

i usually add my 1st 10 points to hp if i know im going to be soloing alot if im in a group i go all str but i use barb with swords

this is not 100% right.. it used to be like this but it has been changed in an update.
it doesnt matter on which lvl you stat points into vitality.. so if you put 10 points into vita at lvl 0 and then go to lvl 30 you will have the same life like you stat 10 points into vita from lvl 20 to lvl 30 and not directly at the start.. so it is never too late.

only hard points into vita (the ones you stat) will add life.. vita from gear is just adding physical defence on armors (depending which armor you use.. it will help the least on robes.. and add the most defence on plates) (other way around with int)