Treated lumber or Lumber studs?

I plan on building a small room, i was looking at lowes lumber online and was wondering if i should use treated wood or not?

Indoors? No. If it's a simple interior room, just use 2x3s. You might have to go to a couple different places to get really straight ones though.

but treated or not treated? thank you.

No. Pretty sure I said no in my first post. Let me see.....yep, there it is "No"

aha i see it now.

No that pente treated wood cannot be good to breathe. Hence its applications outdoors only. Use marine grade spruce or birch if you fear warpage or rot. PVC is very handy anymore. Lots of fittings like Ls and 45s, Ts. Very sturdy, cuts with a simple hacksaw and primer and glue nail it.