In my opinion seating posture is one of the main reasons of discomfort.
About a year ago I was starting to feel pain very frequently in a line from my elbow to my little finger, especially after long work days. I went to a couple of sessions at a good physiotherapist, which helped me a lot to feel the position I'm sitting in. In my case I was hunching shoulders and generally putting myself in a tense posture in front of the computer. Now everyday I stop at regular intervals and just think a few seconds about my posture, feel what's not right and comfortable, then adjust accordingly... which is generally just relax in my case !
You're right to do ask questions and do something about it, good on you !