###Human: What can be the reason for back pain and stiffness? ###Assistant: Hi. From the way you described, it seems that you have a locked back. So, you need a few medicines and physiotherapy.Instructions to reduce back pain and stiffness are as follows: 1. Locked back. 2. Ankylosing spondylitis. Revert back if stiffness persists even after seven days to a orthopaedician and traumatologist online.--->