The Eggshell Rule

You have had a bad back for years. Two rounds of physical therapy, a couple of prescriptions, one MRI you paid for out of pocket a few years back. Then somebody rear-ends you on I-820, and now that same back is worse than it has ever been. The fear shows up on the first call, almost word for word every time: they are going to say this was already wrong with me.

That fear is reasonable, and it is one an adjuster will happily feed. Texas law has a specific answer to it, and the answer favors you more than most people expect.

In Texas we say the defendant takes the plaintiff as they find them. That is the eggshell rule. Basically, an at-fault driver has to accept the person they hit in whatever condition that person was already in, fragile or not. If somebody is weaker, smaller, older, or already carrying an injury, the driver who caused the wreck does not get a discount for it.

So a preexisting condition does not disqualify your claim. It changes what has to be proven. You are allowed to recover for the aggravation, meaning the worsening, and that is a real, compensable category of damages in Texas rather than a courtesy anybody extends to you.

An adjuster who learns about your history will raise it early, sometimes before you understand your own claim's value, because it introduces doubt at the exact moment you are least able to answer it.

Watch for how they go looking for it. One of the standard moves is a blanket medical release: sign here so we can get your records. Do not sign that without your attorney reviewing it. A blanket release lets a carrier pull everything you have ever had, including counseling records that have nothing to do with a car wreck, and they will look for something in there to use against you.

The eggshell rule does not stop the tactic. A documented baseline does. And so I tell clients to disclose a preexisting condition to me upfront, at intake, rather than treating it as something to keep quiet about. Told early, that history becomes an advantage. A claim that can point to a clear before-and-after picture is much harder to discount than one where an old back injury surfaces halfway through, unexplained.

The adjuster's logic is not complicated. A preexisting condition hands them an alternative explanation for your pain, one they did not have to invent.

Without a documented baseline showing what that condition looked like before the crash, the argument that the pain was already there is hard for anyone to disprove, including a jury. That is the whole mechanism. Not that the tactic is clever, but that silence about a prior injury leaves the field open and nobody is standing there to answer.

The eggshell rule is not a talking point I use to reassure people. It is a well-established common law doctrine, sometimes called the thin skull rule, recognized across American tort law including here in Texas, and independently documented by legal reference sources like Cornell Law School's Legal Information Institute.

The doctrine holds a defendant responsible for the full extent of the harm their negligence caused, even where the person they hurt was unusually vulnerable to that harm. It is not an exception carved out for sympathetic plaintiffs. It is the ordinary rule, and it exists so a defendant cannot get a discount for happening to injure someone who was already fragile.

That is also why it shows up the same way in very different cases: a crash, a fall on somebody's property, an injury at work. The underlying question does not change with the setting. How much of this harm came from what the defendant did? What changes from case to case is how much documentation exists to answer it convincingly.

This isn't just firm practice. It's built into how Texas civil juries are instructed to think about the question. Texas's Pattern Jury Charges for general negligence direct a jury not to award damages for a preexisting condition itself, only for the harm the crash's aggravation of that condition actually caused. That instruction exists because the distinction matters. Juries are told this in plain terms: do not punish the injured person for a condition they already had, do not reward them for it either, and compensate only for what the crash changed.

Recovering for aggravation means recovering for the difference this wreck made, not for the condition underneath it.

Say your lower back was manageable before: some stiff mornings, an over-the-counter anti-inflammatory, no treatment in three years. After the crash that same back needs physical therapy, then injections, then a surgical consult. The aggravation is the distance between those two pictures. Your preexisting condition sets the floor, and what the crash added gets measured from that floor upward.

This is why the baseline has to come from records rather than from memory. A vague recollection of feeling fine beforehand carries almost no weight next to a chart entry from a visit two years ago. It cuts both ways, and that is the point. The records that show how limited you were before are the same records that show how much further the crash took you.

Brain injuries are the clearest version of this. A prior traumatic brain injury may have left you more susceptible to the next one, and the next one leaves you more susceptible after that. In those cases the baseline documentation has to be careful, because that is where the value of the claim lives.

The mechanism for recovering under the eggshell rule is distinguishing the old condition from the new injury, and the only way to do that is through medical records. We find the baseline first: what the condition was, how it was treated, how you were functioning. That becomes the comparison point for everything that came after.

So hiding a preexisting condition from your lawyer or your doctor works against you twice. It removes the evidence we need to measure the aggravation, and it hands the carrier a credibility argument when they find it on their own. They will find it. Their business depends on looking.

A lot of people with a history of back pain, a prior surgery, or an old sports injury decide before they ever call that their claim is weaker or not worth bringing. That instinct costs them.

The eggshell rule exists precisely because the law recognizes that nobody shows up to a crash in factory condition. People are older, or smaller, or already carrying something that never fully healed. An at-fault driver takes them exactly as they are, and so does the driver's insurance company.