Pre-Existing Conditions & Your TBI Claim

Almost Nobody Arrives With a Blank Medical Chart

Almost nobody arrives at a brain injury with a blank medical chart.

A concussion in high school, migraines, anxiety, an ADHD diagnosis, the ordinary wear of a lived life: the defense will find all of it and offer it as the real explanation for your symptoms.

The law has an answer older than the insurance industry's playbook, and it runs in your favor.

The eggshell plaintiff rule: a defendant takes the person they injured as they found them. A fragile victim is not a discounted victim.

How that rule works, and how your history becomes proof instead of ammunition, is what this claim turns on.

Call (888) 713-6653 and tell us what the defense will find in your chart. You don't pay unless we win.

The Eggshell Rule: The Defendant Takes You as They Found You

The principle appears in every state's law under one name or another: a negligent defendant is responsible for the harm actually caused, even when the victim was more vulnerable than an average person would have been. The classic teaching image is a plaintiff with an eggshell-thin skull; a tap that would bruise anyone else kills him, and the defendant answers for the death, not the bruise.

Applied to brain injury, the rule does real work. The person with prior migraines who now has intractable ones. The person whose managed anxiety became disabling after the crash. The person whose earlier concussion meant this one hit harder and healed slower. In each case the defense wants to pay for the injury an average person would have suffered; the law says they pay for the injury this person suffered. Vulnerability explains the severity. It never excuses the defendant who caused it.

Aggravation Is Compensable: When Worse Is the Injury

A related doctrine covers the condition that existed and got worse. Aggravation of a pre-existing condition is a recognized, recoverable injury: the defendant is not liable for the migraines you had, and is fully liable for the difference between the migraines you had and the ones you have now.

The measurement is where these cases are fought. The defense argues the condition would have worsened anyway; the claim answers with the trajectory evidence, how stable the condition was, how sharply it changed at the injury, and what the treating history shows about the before and after.

Some states instruct juries formally on apportioning between the old condition and the new harm, and where the aggravation cannot be cleanly separated from the underlying condition, many jurisdictions place that uncertainty on the defendant rather than the victim. The details are state-specific; the structure is universal: worse is an injury, and it belongs in the claim at full weight.

Prior Concussions and the Brain That Was Already Hit Once

Concussion history is the defense's favorite exhibit in a TBI case, and the medicine cuts the other way. A brain with prior concussions tends to be injured more easily and to recover more slowly the next time; the earlier injury did not immunize the person, it sensitized them.^[1] Under the eggshell rule, that sensitivity belongs to the defendant who chose to hit it.

Presented properly, the history reframes: the plaintiff recovered fully from the 2019 concussion, worked five uninterrupted years at full capacity, and then this crash produced deficits that never resolved, which tells a jury the difference was the crash, not the vulnerability. The acute, catastrophic version of a too-soon second blow is its own medical emergency, the emergency second impact syndrome describes; the claims version here is slower but follows the same logic: the prior injury raises the stakes of the new one, and the law assigns those stakes to the person who caused it.

The Records Fight: What the Defense Sees, and Why Honesty Wins

Expect the defense to demand your prior medical records, and expect to produce a real set of them; the scope is negotiated and courts limit fishing expeditions, but a brain injury claim puts your brain's history legitimately in play. Two rules govern everything about this fight.

Two rules govern how that production goes.

• Concealment is fatal. A history the defense discovers after you denied it does more damage than the history itself ever could, because it converts a medical question into a credibility verdict.
• Framed history is safe history. Disclosed early and placed in context, the prior concussion, the treated depression, and the managed migraines become part of an honest before-picture, and the setup behind a mild TBI denial, where the insurer springs the history as a gotcha, never materializes, because there is nothing to spring.

This is a place where experienced counsel earns its keep: deciding what is discoverable, producing it cleanly, and building the frame before the defense builds theirs.

Why the Size of the Change Decides What Your Claim Is Worth

Here is the turn insurers never advertise: the same records the defense wants as ammunition are the claim's best measuring stick. A documented before is what makes the after provable. The pre-injury chart showing controlled migraines quantifies the aggravation. The old performance reviews and school records establish the cognitive baseline that neuropsychological testing as evidence now measures the fall from. Even prior neuropsych or academic testing, where it exists, gives the experts a true before-and-after comparison most cases only wish they had.

So the strategy is the opposite of hiding: gather the history, master it, and make it the ruler the injury is measured against. The claim's value question, the one that drives brain injury settlement values, is always the size of the change; a rich baseline makes the change undeniable.

Deadlines run on the ordinary calendar while records are gathered, so start the collection early, and let the history work for the person it belongs to. Records take time to assemble and the calendar does not pause for it; a missed filing deadline ends a strong claim as completely as a weak one.