Can being seated for long hours with wrists resting on laps cause pain in the ulnar side of wrists?

Due to my schedule, health, and living conditions; I spend almost all of my awake time in an office chair. I don't ever use a couch, Just the single chair I have. While seated I have my wrists resting on my laps, usually with thumbs close to pointing upwards; So the ulnar side of the wrist is what rests on my thighs. I've been having Lots of dull aches on the ulnar side of my wrist and lower forearm. Can that be from the many hours Of my wrist just resting on my lap? From certain amounts of deviation? Or just everything else ('Cu.T.S.', 'RSI' etc...)