How Pre-Existing Conditions Affect a Personal Injury Settlement
Worried that your old back injury or arthritis will tank your injury claim?
You are not alone. The general public automatically believes that a pre-existing condition means your case is over before it begins. Insurance adjusters push this tactic because it’s effective. They use your medical history as a weapon to lowball you.
Here’s the truth:
Having a pre-existing condition doesn’t bar you from recovery. The law protects those with prior injuries — you just need to properly manage the negligence claim.
Let’s break it down…
What this guide covers:
- What Counts As A Pre-Existing Condition?
- How A Negligence Claim Works When You Have One
- The Eggshell Plaintiff Rule (Your Secret Weapon)
- How Insurance Adjusters Try To Reduce Your Settlement
- How To Protect Your Claim
What Counts As A Pre-Existing Condition?
A pre-existing condition is any health issue you had before the accident.
Easy to say but it encompasses a lot. Insurance adjusters will review your entire medical record line by line to try to find something to attribute your current pain to.
Common pre-existing conditions include:
- Old back, neck or spine injuries — including herniated discs and degenerative disc disease
- Arthritis — especially in the joints affected by the accident
- Previous fractures — even ones that healed years ago
- Concussions or head injuries — prior to the new accident
- Mental health conditions — such as anxiety, depression or PTSD
Pretty much any documented medical condition can be raised by the other side. It’s all about how the new accident played together with what was already present.
How A Negligence Claim Works When You Have One
Every negligence claim ultimately turns on the same four elements… duty, breach, causation and damages.
If you have a pre-existing condition, the battle is almost always over causation. The other side will say your pain didn’t result from their client — it resulted from the condition you already had.
But here’s the thing. Pre-existing conditions are extremely common. The personal injury law market accounted for $61.3 billion in revenue in 2024, and a significant percentage of those cases involve clients with pre-existing conditions. So if you’re concerned your case is unique, it’s not. If you want a straight answer for your case, it’s worth the time to talk to a Dallas personal injury lawyer who has experience with negligence claims involving pre-existing conditions.
The correct way is to show the accident aggravated or worsened what was already going on. That distinction is what makes a winning claim vs. a denied one.
The Eggshell Plaintiff Rule (Your Secret Weapon)
This is where things get interesting…
Texas (and most other states) has a legal doctrine called the eggshell plaintiff rule — sometimes called the eggshell skull rule. It’s one of the most important protections you have when filing a negligence claim with a pre-existing condition.
Here’s how it works:
The rule is, the at-fault party must take the victim “as they find them.” Translation… if a healthy person would have just walked away with a sore neck, but you suffer a herniated disc because of an old injury — the at-fault party is still 100% responsible for your full damages.
They don’t get to discount what they owe just because you just happened to be less resilient than normal.
This rule is found in the Texas Pattern Jury Charges (PJC 28.6), and so is given to juries as an instruction. Kind of neat, huh?
Quick example:
You have a mild, manageable spinal condition before an accident. A distracted driver rear-ends your car and your weakened spine takes on more damage, leaving you partially paralyzed. The driver is legally responsible for the full extent of your paralysis — even though a healthier person may have only walked away with a sore back.
That’s the eggshell rule in action.
How Insurance Adjusters Try To Reduce Your Settlement
Insurance companies don’t care about you. It is literally their job to pay you as little as possible.
They pounce on them like you are a parking ticket. Here are the most popular:
- Blame everything on the pre-existing condition — they’ll say they had every symptom before
- Demand years of medical records — trying to find any reason to discredit your claim
- Argue you didn’t receive treatment in a timely manner — denials hint at injuries not being serious
- Pressure you to accept a quick lowball offer — before you know the value of your claim
- Use surveillance — yes, they will sometimes hire investigators to watch you
Their initial settlement demand is often 40-60% lower than what claimants will ultimately receive when negotiating correctly. That’s a massive spread. It’s the reason why so many people who represent themselves in a claim leave money on the table.
How To Protect Your Claim
So how do you fight back?
You must establish a paper trail that clearly differentiates your pre-existing condition from your new injuries. This is the single most important thing you can do.
Get Medical Care Immediately
Don’t delay. The more time that passes between the accident and your doctor’s visit, the easier it is for the insurance company to claim your injuries were not the result of the accident. Seek medical attention within 24 to 48 hours of the accident.
Tell Your Doctor Everything
Don’t hide the fact you have a pre-existing condition. It will just blow your credibility. Tell your doctor about it and explain how it’s different from before the accident.
The phrase you want documented is “aggravation of pre-existing condition.”
Get Your Baseline Medical Records
Pull up your medical records that are from before the accident. This will show what your state was like previously — making it easy to demonstrate the accident made it worse. This is your evidence.
Follow Your Treatment Plan
Skipping physical therapy visits, ignoring prescriptions or stopping treatment early is exactly what the insurance company wants you to do. Follow your plan.
Hire An Experienced Lawyer
Litigating against an insurance company in a pre-existing condition claim can be very challenging. Plaintiffs who are represented by an attorney, on average, recover more than 4.4X more compensation than those who go it alone.
That’s not a small difference. That’s life-changing money.
Final Thoughts
Pre-existing conditions don’t kill your negligence claim — but they do make it more complicated.
The good news? The law’s on your side. The eggshell plaintiff rule prevents negligent defendants from escaping liability simply because their victim was more vulnerable than most. In a nutshell:
- Don’t panic — a prior injury doesn’t disqualify you
- Document everything — medical records before and after are your best proof
- Beware of insurance tactics — their job is to minimise what they pay
- Use the eggshell rule — it forces the at-fault party to compensate you
- Get legal help — represented claimants take home far more
A pre-existing condition can impact your settlement, but it should never deter you from filing a claim.
