Thanks for writing in.
Your pain might just be due to the long hours spent in front of the computer.
The nerves to our hands originate from the cervical spine
and pass through the armpit region into the arms as the brachial plexus
. Any strain will give rise to pain in your upper limbs
. Also you must realise that working on the computer requires you to keep your neck straight for longer times.
Please consult a physiotherapist and learn some simple relaxation exercises. I would also suggest you to take 5 minutes break for every hour that you spend in front of your computer.
Hope this helps.