Hi,
A massage chair can cause back pain? That is weird.. Anyway, since you are experiencing it, i am so sorry to hear that. Anyway, I would like to know if you have bad posture. Cause this maybe contributing to your pain. Poor posture can bring a lot of trouble such as neck pain and back pain even if you are sitting in a massage chair. However, there are solutions to this. There are free ways and there are dont. Free way: watch some video over Youtube (or any video sharing websites) or try to read some posts. Not Free: Purchase a posture brace. A lot of people are buying this because it helps correct their bad posture, and sooner rather than later, their back pain is no more to be felt. This is just my suggestion, you can also consider other options though.