It is not the responsibility of the insurer of the person at fault to pay for any pre-injury complaints. If you were already experiencing pain before the injury it is very important to note the increase in intensity and frequency of pain following the accident as this will help to establish a baseline for the current and past levels of pain. On the other hand, if you had prior injuries to the same body parts as those that were injured during the accident but no pain or limitation in function six months prior to the accident, then it is probable that the old injury had healed completely and any current complaint is due to the current accident.