You can never lie, or even “stretch the truth,” even unintentionally, to your attorney in your personal injury case. Trust that the defendant's insurance company will find out about anything you fail to tell your attorney. All of your medical records can eventually be presented as evidence and insurance companies have an indexing system which will tell them whether the injury victim was ever involved in a prior accident. Insurance companies will employ investigators to provide surveillance of your home and work. Request may be made to review your Facebook account, or other social media sites, if you have one.
Insurance companies go through great lengths to show that your injury could have come from anything other than the defendant's negligent conduct. The easiest way to deal with this issue is to be honest with your attorney. Your attorney will guide you through this minefield so that nothing else is discovered that could hurt your case down the line. When discrepancies are discovered is when you lose all credibility.