It is often the case that large things have small beginnings. This can be the case when you have been in what may at first seem to be a minor car accident with another vehicle. For instance, a low-speed, rear-end accident, caused when the driver behind you becomes distracted, may only cause a small scratch on your bumper. You get out of your car, spend a few minutes swapping insurance information with the other driver, and that's that. Or so it seems.
A few weeks later you start noticing things: soreness in one of your shoulder and arms or pain when you turn your head in one direction. For some reason, your fingers in that sore arm seem to be going numb. At first you wait, hoping that the problem will get better on its own.