A pre-existing condition does not bar you from filing a personal injury claim. Under the eggshell skull rule, a defendant is fully liable for harm they cause, even if the victim’s prior health made the injury worse. What matters is whether the accident aggravated your condition, not whether you were in perfect health before it occurred.
Personal injury claims involving pre-existing conditions are among the most contested in the United States, because insurers routinely use prior medical history to argue that injuries are unrelated to the accident. Medical records, imaging, and expert testimony become critical tools in separating pre-existing symptoms from new or worsened harm. Victims who suffered an accident caused by someone else’s negligence are entitled to compensation for the aggravation of a prior condition, not just entirely new injuries.
The sections below explain the key legal rules, how insurers challenge these claims, and what steps you can take to protect your right to full compensation.
The Eggshell Skull Rule Explained
The eggshell plaintiff rule is a foundational principle of U.S. tort law. According to Cornell Law School, a defendant is responsible for the full extent of a plaintiff’s harm as long as the injury was proximately caused by their wrongful act, no matter how severe or unforeseeable the result. A defendant must “take the victim as they find them.”
This means if you had a prior back injury and the accident made it significantly worse, the at-fault party is liable for that full worsening, not just the harm a healthy person would have suffered.
Aggravation vs. Pre-Existing Condition: What’s the Difference?
A pre-existing condition is any injury, illness, or medical history that existed before the accident. Aggravation means the accident made that condition measurably worse, more painful, or more disabling. Only the aggravation is recoverable from the at-fault party, not the underlying condition itself.
Proving aggravation requires a clear causal link between the defendant’s breach and the worsening of your condition. Causation is one of four required elements of a negligence claim, and the plaintiff bears the burden of establishing that the defendant’s conduct directly produced the harm.
How Insurers Use Pre-Existing Conditions Against You
Insurance companies routinely argue that your injuries were caused by your pre-existing condition rather than the accident. They will review your medical records for prior treatments, diagnoses, and gaps in care to build that argument. This tactic is common even in cases involving clear liability.
Independent medical examinations requested by the insurer often favor their position. Having your treating physician document your baseline condition before the accident and the measurable change after it is essential to countering this defense.
What to Do Next: Steps to Protect Your Claim
If you have a pre-existing condition and were injured in an accident, take these steps:
- Seek medical care right away and tell your doctor about both your prior condition and your new symptoms.
- Request copies of all pre-accident medical records to establish your baseline health.
- Document every symptom change pain levels, mobility, daily limitations from the date of the accident forward.
- Avoid giving recorded statements to the at-fault party’s insurer without legal guidance.
- Contact a personal injury attorney who can retain medical experts to support your aggravation claim.
Key Takeaways
- A pre-existing condition does not disqualify you from filing a personal injury claim.
- The eggshell plaintiff rule holds defendants liable for the full extent of harm, even when worsened by prior health issues.
- You can recover compensation for the aggravation of a pre-existing condition, not the condition itself.
- Insurers routinely use prior medical history to dispute claims, strong documentation is essential.
- Medical records, expert testimony, and a clear before-and-after comparison are your strongest tools.
- Acting quickly after an accident preserves the evidence needed to prove causation and aggravation.
- A personal injury attorney can help separate pre-existing damage from accident-related harm and maximize your recovery.