Yes, delaying medical treatment after an accident can ultimately hurt your personal injury cases. In many instances, insurance adjusters will mislead or allow injured victims to delay treatment until so much time has passed that the insurance company can dispute the claim. The liable insurance company may question if the treatment you are seeking is related to the accident in question if too much time has passed. For this reason, as well as for your own personal health and recovery, it is very important that you seek proper medical treatment as soon as possible after an accident.