The term "paracentral disc protrusion" is can be explained by taking a separate look at the words it is made of:

• Paracentral - This term comes from the Greek words "para"&" kentron" and means next to the center of something.
  
• Disc - Also of Greek origin: "diskos", which means disc (I think this one's clear...
  )
• Protrusion - This one comes from the Latin term "protrudere" which stands for pushing something through.
  

And now let's summarize: roughly, you have got a paracentral disc protrusion when one of your discs (the jelly-like thing that you have between each two of your back bones) is somehow squeezed or pushed out of it's natural position and touches a spinal nerve.
This can either happen (a) as a result of repeated strains and injuries of the same spot or (b) as a consequence of a traumatic event.
Paracentral Disc Protrusion and the Pain A disc protrusion can go unnoticed in some cases, meaning the patient doesn't feel any pain or discomfort.
Unfortunately in most of the cases this is not the case, and the whole situation can become quite painful.
There are several treatment possibilities to relieve the acute pain: pain-killers, relaxants, anti inflammatory drugs, ice and heat packs, physiotherapy and even surgery.
These methods, however, only help combat the symptoms, and not the real root cause of the problem.
In order to get rid of the pain for good there has to be some more understanding of the underlying condition.
Each patient has a very specific and unique muscle imbalance that has to be completely figured out so a targeted treatment can be started.