HOWTO SIT - relieve back pain and neck pain

See this article about how to sit in a chair.

The middle of the page has a good "If you experience this problem" - "Caused by:" - "Try this:" table.

In my case I was looking for the "Neck tension, tightness, upper back and shoulders tension." case and the solution seems to relieve the situation very effectively.

I would also like to add that the pillow you use to sleep on also plays a significant role about neck pain too. I remember once I had a severe neck pain until I can't even sleep well then I changed my pillow and it significantly helped.