If you have had a prior injury or pre-existing condition, making sure the insurance company takes responsibility for the harm caused by the accident can be more complicated. But an experienced attorney can still help you obtain the full and fair compensation you are entitled to.
The myth that pre-existing conditions disqualify you
Many people with prior injuries assume they have no chance of winning a case. They believe that an insurance company can simply dig up their old medical records, prove that they’d already been hurt, and use that as grounds to deny the claim. As a result, scores of legitimate claimants with legitimate damages never come forward.
This is not how the law works. The relevant legal question in these cases is not whether you were in perfect health before the accident. It’s whether the accident made things worse. That subtle – but critical – shift, from “origination” to “aggravation”, is the legal principle that supports the entire category of these claims and has been a part of common law for more than a century.
Nationally, roughly 60% of American adults are living with at least one chronic condition (things like arthritis, degenerative disc disease, or diabetes), (CDC data). The typical personal injury plaintiff, in other words, is not a healthy 25-year-old with a clean bill of health. The court system understands this, and the rules are set up the way they are for a reason.
The eggshell skull rule: the defendant takes you as you are
The basic legal rule in play here is the Eggshell Skull Rule. It operates under the principle that a negligent defendant is responsible for all the damage they cause, even if the particular condition or susceptibility of the injured party was such that the damage was unexpectedly severe.
Imagine someone with extreme osteoporosis gets rear-ended at very low speed. A driver with normal bone density would probably feel a jolt but be otherwise fine. In this case, the person with osteoporosis fractures their spine. The defendant is not entitled to a deduction because the plaintiff was abnormally susceptible to injury. The defendant caused the accident; therefore they must bear the responsibility of their actions.
This is incredibly important for people who have conditions such as Degenerative Disc Disease, previous spinal damage, or any joint issues. The defendant can’t try to argue that they should only have to pay for the injury that an “average” and “normal” person would have suffered. They must compensate the injured party regardless of their pre-existing conditions.
Aggravation versus exacerbation: why the distinction matters for damages
Exacerbation and aggravation are often used interchangeably, but they couldn’t be more different. What both have in common is they spell pre-existing conditions that are suddenly made worse by a car accident. But where they differ is in how permanent the damage is and subsequently how compensation is calculated.
An exacerbation is a temporary flare-up of an old injury. You felt fine and healthy and then, a minor rear-end collision caused old back problems to turn painful and inflamed. Over time, your symptoms gradually subsided, and you are back to being your pre-accident self.
That’s an exacerbation. You get compensated, rather easily for any medical bills or treatment you received due to your worsened condition. You are also entitled to compensation for the pain and suffering you experienced while recovering from the whiplash and treatment.
An aggravation is far more problematic. The accident itself may be similar to the one above but the result is much more serious. An aggravation of a pre-existing condition is a new injury or an exacerbation that does not resolve itself or get better with treatment.
How insurance companies use prior injuries against you
Insurance adjusters are trained to stick to a plan, and one of the most effective tactics they have is to use pre-existing conditions against you. Essentially, the game plan is simple: if they can persuade a claims evaluator, arbitrator, or jury that your existing pain and limitations predate the auto accident, truck accident, or workplace injury, they can claim the injury did not affect you in a new way and deny your claim, or at least catastrophically lowball it.
Don’t underestimate how far an adjuster or defense attorney will go to make this play work. They will dig into your past medical history as far as possible to look for previous complaints, symptoms, or treatment that mirror your current experience. Then they’ll argue that your prior complaints or conditions are the true cause of your pain.
How do they get access to so much of your past medical information? Well, one of the first paperwork tricks you’ll face after a serious accident is the medical authorization. You might be told it’s “standard” to sign this wide-ranging form right away.
But in most cases, these authorizations are drafted in a way that lets the insurance company demand records going back ten years, fifteen years, or more – and not just related to prior conditions or complaints. If you twisted your knee in a sports incident or had a partial knee replacement a decade ago, they’ll include that.
If you were treated for fertility or depression, they’ll include that, too. Adjusters and defense attorneys are specifically looking for past problems to blame for your current pain.
This is where professional legal guidance is not optional. A Beaumont personal injury lawyer can push back on overbroad medical releases, limit the scope of records requests to what is actually relevant to the accident, and prevent insurers from turning your entire medical history into ammunition. Signing those forms without legal review is one of the most common and costly mistakes claimants make.
Diagnostic imaging as objective proof of new damage
Comparative imaging is one of the best ways to counter the argument that you were already in bad shape before the accident. If the MRI of your cervical spine from two years ago showed five herniated discs, an MRI taken immediately after the accident shows six, and three of the herniations aren’t in the same discs as any of the herniations that appeared on the old scan, that’s about as objective an indicator as you’re going to find that this wreck made you worse.
Tell your doctors exactly what changed
How you talk to your treating physician after an accident is incredibly important for your care and your claim.
“Doc, my back hurts,” is not helpful. “I’ve never felt pain like this in my life, it’s unbearable” is not helpful either. It’s going to make the difference in how your claim develops.
“What’s hurting you today, Mr. Johnson?” “Doc, it’s different. It’s the craziest thing.” You want the biggest distinction between the way you felt and where the pain was located or how you were limited before the crash and what is going on post-crash. Your doctor needs to know this. It needs to be in your records, consistently.
Is the new pain in a different place? Is it in the same place but radiating somewhere it didn’t before? Is the intensity different? The character? (sharp, dull, constant, positional) Was there new limitation you didn’t experience before?
Medical honesty is non-negotiable
Hiding a prior injury from your doctor, attorney, or during a deposition is the quickest way to lose your personal injury claim. And you will get caught. Defense attorneys leave no stone unturned when gathering evidence. They will subpoena records, examine insurance billing records, and contact your previous healthcare providers.
If you neglect to mention a prior back injury and they uncover records indicating that you received treatment for it, your case isn’t weakened – it’s handed to the defense on a silver platter, accompanied by a credibility chasm that they will drive a truck through at every opportunity.
A plaintiff who is discovered to be omitting prior injuries is perceived as dishonest. Once a jury or adjudicator loses confidence in a claimant’s honesty, everything else they say loses credibility. The damages the injured party might have won are drastically reduced, and in many cases, the entire claim is dismissed.
Best to let your attorney know all of your medical history right up front. They can help frame it in the best light, show how the previous injury was aggravated, and how this new claim is distinct. They cannot do that if the defense brings up things you neglected to tell your lawyer.
The role of expert medical testimony in proving aggravation
Proving aggravation isn’t just a matter of saying the accident made things worse. Courts require a legal standard of proof, and meeting that standard typically requires a physician to say so directly – in a formal narrative report or as a witness.
A treating physician who has seen you both before and after the accident is well-positioned to provide this kind of opinion. They can speak to your pre-accident baseline, describe the changes they observed following the collision, and offer a medical opinion to a reasonable degree of certainty that the accident caused or significantly accelerated the worsening of your condition.
In more contested cases, a forensic medical expert – someone who reviews records and imaging specifically for litigation purposes – may be needed to provide apportionment testimony. Apportionment is the legal process of separating the disability and pain attributable to the accident from the disability and pain that existed before it. That testimony is often what translates the medical picture into a specific damages figure the court can work with.
Your attorney’s job is to identify the right experts, prepare them properly, and make sure their testimony holds up to the scrutiny of cross-examination.
Don’t let a prior injury become the reason you walk away with nothing
When you have pre-existing conditions, the defense will be looking for ways to discredit your claim. They may argue that your current pain and suffering is all from that past injury or medical condition and has nothing to do with the recent accident. But with the right approach, you can counter these tactics.
This includes being very honest and upfront about your medical history, gathering the right medical records and expert testimony, as well as having a skilled attorney on your side.