A prior injury does not disqualify your claim, and it does not give an insurance company a free pass to pay you less. Under what’s known as the eggshell plaintiff rule, the law requires that a negligent party take you as you are, including any pre-existing conditions that make your injuries worse.
That means if a crash aggravates an old injury, the at-fault party can still be responsible for the full extent of the harm they caused, even if someone else might not have been hurt as badly in the same situation. Courts recognize that real people aren’t perfect and come with medical histories, vulnerabilities, and prior injuries.
At Cogburn Davidson Injury Lawyers, we’ve recovered over $250 million for injured clients. We’re led by Jamie Cogburn, who is 1 of only 19 Certified Personal Injury Specialists in Nevada, with a firm-wide focus on trial readiness. We know how to go beyond proving what happened to how it changed your life.
In this guide, we’ll break down:
- What the eggshell plaintiff rule actually means
- Key legal terms you need to understand
- How prior injuries are handled in real claims
- And how to prove aggravation and recover what you’re owed
Legal Terms to Know
Eggshell Plaintiff Rule
The eggshell plaintiff rule means a defendant is liable for a plaintiff’s injuries even if the injuries are more severe due to a pre-existing condition. The defendant cannot argue that the victim was unusually fragile to avoid responsibility (Cornell Law School – Eggshell Skull Rule).
Pre-Existing Condition
A pre-existing condition is any injury, illness, or medical issue that existed before the accident. These conditions don’t bar recovery—but they often become a point of dispute.
Aggravation of Injury
Aggravation refers to the worsening of a prior condition due to a new incident. The law allows recovery for the additional harm caused, not the original condition itself.
Burden of Proof
The burden of proof in a personal injury case requires showing that the defendant’s actions caused or worsened your injuries, typically by a “preponderance of the evidence” (Cornell Law School – Burden of Proof).
What Is the Eggshell Plaintiff Rule?
The eggshell plaintiff rule is a doctrine in personal injury law that focuses on foreseeability and responsibility. It holds that once negligence is established, a defendant is legally accountable for the actual consequences of their actions, even if those consequences are unusually severe.
As such, a defendant cannot reduce liability by arguing that the injuries were unpredictable or disproportionately severe. Once fault is established, responsibility extends to the full consequences of that conduct.
In other words, the law does not measure harm based on what “typically” would have happened. It measures harm based on what did happen to the specific person involved. Courts apply this principle when evaluating damages—not fault:
- Fault is about whether someone acted negligently
- Damages are about the extent of harm caused
The eggshell plaintiff rule applies after negligence is proven. At that point, the focus shifts to the real-world impact of the injury, not a hypothetical “average” outcome.
This rule exists to prevent a legal loophole. Without it, defendants could argue that they should only be responsible for “typical” injuries—effectively reducing compensation whenever a person’s condition leads to more serious consequences.
This rule is most often applied in cases involving:
- Complicated medical histories
- Underlying physical conditions
- Injuries with disproportionate outcomes
How Prior Injuries Are Proven in a Claim
Step 1: Document Your Medical History Early
The first step is to be transparent with your legal team. From there, they will:
- Gather prior medical records
- Identify baseline conditions before the accident
- Compare them to your current condition
Insurance companies will find your medical history anyway; the difference lies in whether it’s used against you or explained correctly.
Step 2: Establish a Clear Before-and-After
The core of these cases is showing change. That means proving:
- What your condition was like before
- How your condition is now
- How the accident made it worse
This often involves:
- Imaging comparisons (MRIs, X-rays)
- Physician notes
- Functional limitations
Step 3: Prove Aggravation with Medical Evidence
Proving aggravation typically requires:
- Treating physician opinions
- Specialist evaluations
- Consistent treatment records
Medical documentation is critical because courts rely heavily on objective evidence when determining causation and damages.
Step 4: Use Expert Testimony to Connect the Dots
In more complex cases, expert witnesses help explain:
- How the accident worsened the condition
- Why symptoms increased
- What future impact looks like
This is especially important when insurance companies argue that your pain is “just pre-existing.”
Step 5: Separate Old Injury from New Harm
You are not compensated for the original condition, but you are compensated for what changed. As such, your legal team must clearly show:
- The degree of worsening
- The additional treatment required
- The added impact on your life
Step 6: Anticipate the Insurance Company’s Argument
We hear these arguments all the time:
- “You were already injured.”
- “This isn’t from the accident.”
- “Your condition would have worsened anyway.”
The truth is that those arguments only work if your case isn’t built properly. At Cogburn Davidson, we prepare these cases for trial from day one because that’s what it takes to overcome these defenses and force fair compensation.
Injury Types and Compensation
| Injury Scenario | What It Means | What You Can Recover |
| New Injury | No prior condition existed | Full compensation for all damages related to the accident |
| Aggravated Injury | A prior condition was worsened by the accident | Compensation for the increase in severity, pain, and required treatment |
| Pre-Exisitign (Unchanged) | Condition exisited but was not affected | Typically not compensable in the claim |
| Latent Condition Triggered | Condition exisited but was asymptomanic unitl the accident | Compesnation may apply if the accident activated or accelerated symptoms |
Frequently Asked Questions About Prior Injuries and Injury Claims
Can the insurance company hire its own doctors to challenge my injuries?
Insurance companies may request an Independent Medical Examination (IME), where a doctor they select evaluates your condition. The defense typically arranges these exams and may be used to argue that:
- Your condition hasn’t worsened
- Your symptoms are unrelated to the accident
- Your treatment isn’t necessary
Courts allow these examinations under certain conditions, especially when a plaintiff’s medical condition is in dispute (Federal Rules of Civil Procedure, Rule 35).
Are mental health conditions treated the same as physical conditions?
Pre-existing mental health conditions—such as anxiety, PTSD, or depression—may also be impacted by an accident. If the incident worsens those conditions, that change can be part of a claim. Mental health claims typically require:
- Clinical diagnosis
- Treatment records
- Expert or provider testimony
What happens if my prior injury was never formally diagnosed?
If you had symptoms but no formal diagnosis before the accident, the case may rely more heavily on your testimony and medical evaluations after the incident. Expert opinions on whether the condition likely existed before are also helpful. The absence of prior records doesn’t automatically prevent recovery, but it does make documentation and expert analysis even more important.
Can surveillance or private investigators be used against me?
Yes. Insurance companies sometimes use surveillance or investigators to observe claimants’ activities in an attempt to show that physical abilities are inconsistent with reported limitations, or that activities suggest less severe injury. Courts generally allow surveillance evidence if it is relevant and lawfully obtained, but its weight depends on context and interpretation.
Does state law affect how prior injuries are handled?
Yes, state law can influence how these cases are evaluated. For example:
- Comparative fault rules vary by state
- Damage calculations may differ
- Jury instructions on pre-existing conditions can vary
In Nevada, courts follow established negligence principles and allow recovery for harm caused or worsened by another party’s actions, consistent with broader tort law frameworks.
We Won’t Let Your Past Be Used Against You
Cases involving prior injuries are where insurance companies push the hardest. They will look for any reason to minimize what you’re going through, shift blame, or argue that your condition isn’t their responsibility, and that’s not something you should have to navigate on your own.
That’s why Cogburn Davidson is not a high-volume settlement firm—we take fewer cases so we can give each one the attention it deserves. Our attorneys have secured multi-million and eight-figure results, and we’ve built a reputation for handling complex injury claims, including those involving nursing home abuse, negligent security, and serious, life-altering injuries.
Our team is also actively involved in shaping Nevada law through leadership and advocacy, giving us a deeper understanding of how these cases are argued—and won—both inside and outside the courtroom.
If you’re dealing with a prior injury and wondering how it affects your case, schedule a free case evaluation with Cogburn Davidson Injury Lawyers today. There’s no upfront cost, no obligation, and no risk, just a real conversation about your case and what it will take to protect it.