Back bone is a skeletal part of the body
Yes, I sometimes get back pain. It's quite common. 
What could be the cause of back pain?
There can be many causes, but the lumbar area is most often affected, becasue it supports the weight of the upper body. 
What part of the body is the Lumber area ?
I think it's the lower part of the spine. Injury there can impact bowel function, walking, and anything to do with the lower half of the body.  
OK that good! So are there any cure or remedy to back pain/ache
I tried acupunture once, where needles are inserted under the skin. It felt really weird!