The Insurance Company Says They Don’t Have to Pay for the Worsening of Your Pre-Existing Condition? The Law Says They’re Wrong!

You were in a car accident. You went to the doctor. And now the insurance company is telling you that your injuries don't count, because you had a prior condition, an old injury, or a history of depression, back pain, migraines, or anxiety.

This is one of the most common tactics insurance companies use to pay you less than you deserve. And in California, it doesn't hold up.

There is a legal rule that has existed for over 100 years specifically to protect people like you. It's called the Eggshell Skull Rule,  and it means that just because you had a prior injury or condition before the accident doesn't mean the other driver gets off the hook for making it worse.

What Does "Eggshell Skull" Even Mean?

The name sounds strange, but the idea is simple.

Imagine someone has a skull that is unusually fragile, as thin as an eggshell. Another person bumps into them,  the kind of bump that wouldn't seriously hurt most people,  but because of that fragile skull, the injury is catastrophic.

Can the person who caused the bump say, "Well, it's not my fault they had a weak skull"?

No. Absolutely not.

Under the law, if you cause an accident, you are responsible for the harm you caused — even if that harm turned out to be much worse than it would have been for someone else. The law says you have to take the person you injured as they are, not as you wish they were.

That's the Eggshell Skull Rule. And it applies to you.

What This Means in Real Life

Here are situations we see all the time where this rule protects injured people: 

You had a history of back or neck problems. Maybe you had a prior back injury, degenerative disc disease, or arthritis. The insurance company says the accident just "aggravated" something that was already there and offers you next to nothing. But here's the truth:  if that accident made your back significantly worse, caused new pain, or turned a manageable condition into something debilitating, the other driver is responsible for all of that. Your back being vulnerable before the crash is not a discount on what they owe you. 

You have a history of depression, anxiety, or mental health treatment. This one comes up more than people realize. If you had depression or anxiety before an accident,  even years before,  and the trauma of the collision triggered a serious episode, worsened your symptoms, or led to a formal diagnosis, the other side cannot simply point to your prior history and walk away. California law is clear: they are responsible for what their negligence did to your mental health, even if you had a vulnerability going in.

You previously had migraines or headaches. Prior headache history does not give the at-fault driver a free pass if the collision caused chronic, debilitating migraines, especially for younger victims who now face a lifetime of that condition.

You are older and your body healed more slowly. A 65-year-old who takes longer to recover from a collision, or whose injuries are more severe because of age-related bone density loss, is entitled to full compensation for that recovery,  not a reduced payment because the insurance company thinks a younger person would have bounced back faster.

The Insurance Company Knows This Rule Exists but They STILL always make this Argument !  

When an adjuster tells you your claim is worth less because of a pre-existing condition, they are not giving you legal advice. They are making a business calculation. They are betting that you don't know your rights, that you won't push back, and that you'll accept a lowball offer and move on.

What they won't tell you:

✔ California juries are instructed that a defendant is responsible for all harm caused — including harm that was made worse by the plaintiff's pre-existing vulnerability. This is literally read to the jury before they deliberate.

✔ "Pre-existing" doesn't mean "not your fault." If your condition was dormant, managed, or not significantly affecting your life before the accident — and now it is — that change is what the other driver caused, and that is what they owe you for.

✔ The burden is on them to prove that your current condition has nothing to do with the accident. A prior history alone doesn't meet that burden.

The Difference Between "I Had This Before" and "This Was Already Ruining My Life"

There is one nuance worth understanding. The law does distinguish between:

• A condition you had before that was under control, dormant, or resolved and the accident made significantly worse.  Full protection under the Eggshell Skull Rule!!!!
• A condition that was actively disabling you right before the accident, that would have continued to affect you regardless. In that case, you can still recover damages,  but for the portion the accident caused or worsened.

This is exactly why having an attorney review your complete medical history matters. The details in your records tell the story of where you were before and how dramatically things changed after. That story is what wins cases.

What You Should Do If the Insurance Company Is Using Your Medical History Against You 

1. Don't accept their framing. A prior condition is not a waiver of your rights. It is not an admission that you aren't hurt. It is not a reason to settle for less.
2. Get your records together. The stronger the contrast between your life before the accident and after, the stronger your case. Gather your prior medical records, your post-accident records, and anything that documents how your daily life has changed.
3. Talk to an attorney before you settle. Once you sign a release, it's over. You cannot come back later when you realize your injuries were more serious than the insurance company led you to believe. A consultation costs you nothing and could change everything. You can call us or e-mail me directly at Emilia@antonyanmiranda.com. The first consultation is always free and no fees until we win!

You Deserve Full Compensation.

You didn't choose to have a vulnerable back, a history of depression, or chronic headaches. You didn't ask to be in that accident. And you are not required to subsidize the other driver's negligence just because your body happened to be more susceptible to harm.

The law was designed to protect you. The Eggshell Skull Rule exists precisely because courts recognized, over a century ago, that it would be deeply unjust to penalize an injured person for their own vulnerabilities.

Just because you had this before doesn't mean the other side isn't responsible for making it worse. Don't let them tell you otherwise.

If you or someone you love has been injured in an accident and the insurance company is using your medical history against you, reach out to our office. We have handled cases exactly like yours, and we know how to fight back.