Quick Answer: A preexisting condition does not automatically defeat an Illinois car-accident claim. The issue is whether the collision caused a new injury or aggravated an existing condition. Medical history, before-and-after function, treatment, and causation evidence help establish what changed.
Perhaps you had occasional back pain before the collision. Now you cannot sit through a workday. Perhaps an old neck injury had settled down. Now you need treatment again. When the adjuster points to arthritis, degeneration, or prior surgery, the important question is what the collision changed.
An old diagnosis should not become a shortcut for dismissing a new injury.
If an insurer is blaming your symptoms on your medical history, contact Duran Law Offices for a free consultation at 312-300-0473. Se habla español.
What Illinois law says about aggravation
Illinois’s current civil damage instructions recognize aggravation of a preexisting ailment or condition. IPI Civil 30.01, Measure of Damages—Personal and Property, tells the jury, where the evidence supports it, to consider aggravation when determining damages proved to have resulted from the defendant’s negligence or wrongful conduct.
A prior condition does not, by itself, eliminate a claim for harm the collision caused or made worse. Its existence alone does not establish a right to damages: liability, medical causation, and collision-related damages still must be proved. The relevant question is what harm this crash caused or aggravated.
The difference between an old diagnosis and your actual baseline
A medical chart may show arthritis, a prior disc finding, or an earlier surgery. What it may not explain in one line is how you were functioning immediately before the crash.
Consider a hypothetical worker with occasional low-back soreness who had not needed treatment for years and could lift, drive, and work without restrictions. After a collision, that person develops persistent pain, needs physical therapy, and receives a specialist referral. The relevant comparison includes both the prior history and the new limitations.
Someone already receiving frequent treatment for the same symptoms presents a different timeline. That history requires careful evaluation, including whether the crash increased the symptoms, changed their pattern, or created additional limitations.
The evidence that can show what changed
| Evidence |
Before the crash |
After the crash |
| Symptoms |
Location, frequency, severity, and whether symptoms had resolved |
New complaints or a documented increase in existing symptoms |
| Daily function |
Work duties, exercise, household tasks, and existing restrictions |
Tasks that became harder or impossible and any new restrictions |
| Treatment |
Last visit, prior procedures, and active care |
New visits, referrals, medications, or treatment escalation |
| Medical findings |
Earlier examinations, imaging, and physician assessments |
Later findings and medical opinions explaining the change |
A useful timeline identifies dates and concrete changes. “I had a bad back” is much less informative than explaining when you last treated, what you could do before the collision, and what became difficult afterward.
What if the MRI says degenerative
The word “degenerative” can become the centerpiece of an insurer’s argument. It still needs context. A finding on an image is one part of the medical record; the treating provider’s assessment, symptom history, examination findings, and changes in function also matter.
An MRI alone may not establish when a condition developed or why it became symptomatic. We examine how the imaging fits the chronology rather than accepting an old finding as the entire explanation for a client’s current limitations.
Prior records and surgery can clarify the claim
Prior medical records can help establish that an earlier problem resolved, that you returned to unrestricted activity, or that your symptoms were different before the crash. They can also reveal issues that need to be addressed directly.
Prior surgery requires the same careful approach. Recovery records, existing restrictions, and the new treatment course may help physicians distinguish an old problem from a new injury or aggravation. An insurer’s statement that you “already had surgery” does not substitute for that analysis.
What to do if the insurer raises your medical history
- Tell your lawyer about prior injuries, surgery, and treatment, including symptoms that were still present before the crash.
- Identify earlier providers and approximate treatment dates so relevant records can be obtained.
- Describe changes in symptoms and in work, sleep, movement, and household activities accurately to your medical providers. Preserve restrictions, appointment records, and other documents showing those changes.
- Discuss requests for medical records or authorizations with your lawyer before responding so their scope and purpose can be evaluated.
Accuracy protects your credibility. If prior symptoms existed, explain them. If they had resolved, explain when. The strongest account is the one the records and your actual experience support.
How Duran Law Offices builds the medical story
We organize the medical history around the disputed issue: what harm did this collision cause? That means comparing prior care with post-crash treatment, identifying changes in function, and evaluating the medical opinions supporting those changes.
If an adjuster relies on an old diagnosis, we look for the evidence needed to answer that argument. Was the client working without restrictions? Had treatment ended? Did symptoms intensify or change? What do the treating physicians attribute to the collision? Those details allow us to present the claim with substance.
Learn more about working with a Chicago car accident lawyer at Duran Law Offices. If your symptoms developed after you left the scene, our article on delayed pain after an accident explains why documenting the actual sequence matters.
Before accepting an insurer’s conclusion that your injuries were “already there,” request a free consultation. Call 312-300-0473. Se habla español.
Frequently asked questions
Can I recover if I had back pain before the crash?
Potentially. A prior history does not automatically bar recovery. The claim must establish the harm the collision caused, including any supported aggravation of an existing condition.
Does arthritis mean the insurer can reject my injury claim?
An arthritis diagnosis alone does not resolve the claim. The medical evidence must be evaluated to determine whether the crash caused new harm or worsened your condition.
Should I tell my lawyer about treatment from years ago?
Yes. Earlier records can establish your baseline and help your lawyer address questions about the same body part.
Can the insurance company deny my claim because I had a preexisting condition?
An insurer may dispute causation or damages based on prior history, but a preexisting condition alone does not decide the claim. The analysis depends on what the collision caused or aggravated and what the evidence supports.