Handling Pre-Existing Conditions in a DIY Claim (2025)

## A Prior Injury Is Not a Dead End

Adjusters love to discover a pre-existing condition. They use it to argue your pain came from the old injury, not the accident, and that they owe you little or nothing. But a prior condition does not bar your claim. The law allows you to recover for the aggravation or worsening of a pre-existing condition. Handling this correctly is key to a fair DIY settlement.

What the Law Actually Says

Two important legal principles work in your favor:

1. **Aggravation rule:** you can recover for the worsening of a pre-existing condition caused by the accident, even if you cannot recover for the original condition itself.
2. **Eggshell plaintiff rule:** the at-fault party takes you as they find you. If you were more vulnerable to injury because of a prior condition, they are still liable for the full harm they caused.

Together, these mean a pre-existing condition does not eliminate your claim. It just requires careful documentation. Our [injury types guide](/injury-type) explains how these principles apply.

The Danger of Hiding It

The worst thing you can do is hide a pre-existing condition. Adjusters investigate, and prior medical records are usually discoverable. If you deny a prior condition that the records reveal:

• Your credibility is destroyed.
• The adjuster gains a powerful argument.
• Your entire claim, not just the disputed part, is undermined.

Honesty is not just ethical here; it is strategic. Disclose the condition and frame it correctly.

Step One: Establish Your Baseline

The key to a pre-existing condition claim is showing your condition before the accident versus after. Document your baseline by:

1. Gathering prior medical records for the affected body part.
2. Showing your level of function before the accident.
3. Documenting that the condition was stable or resolved.
4. Noting any prior treatment and when it ended.

A clear baseline is the foundation. If you were functioning well before the accident, the worsening afterward is easier to prove.

Step Two: Document the Worsening

Next, show how the accident made things worse:

• New or increased symptoms after the accident.
• New treatment that the prior condition did not require.
• A change in your functional ability.
• Your doctor's opinion connecting the worsening to the accident.

The medical evidence that the accident aggravated your condition is the heart of your claim. A treating physician's statement linking the accident to the increased symptoms is especially powerful.

Step Three: Get a Clear Medical Opinion

Your treating doctor's opinion can make or break the claim. Ask the doctor to document:

1. Your condition before the accident.
2. The change caused by the accident.
3. The treatment now required because of that change.
4. The causal connection between the accident and the worsening.

A clear, written causation opinion turns a contested claim into a payable one.

How Adjusters Attack Pre-Existing Conditions

Be ready for these arguments:

• "Your pain is from the old injury, not our crash."
• "You would have needed this treatment anyway."
• "Your records show this condition existed before."

Counter each with your baseline evidence and your doctor's causation opinion. The distinction you must drive home is between the pre-existing condition itself and the accident-caused worsening of it. You are claiming only the latter.

Calculating the Aggravation Value

Your claim value should reflect the worsening, not the entire condition. Focus your damages on:

1. New treatment costs caused by the accident.
2. Additional lost wages from the worsening.
3. The increased pain and suffering attributable to the aggravation.

Be honest about what is new versus what predated the accident. A credible, well-bounded claim settles better than an overreaching one. Our [settlement guide](/settlement) shows how to build the figure.

When to Hire a Lawyer

Pre-existing condition claims are among the more complex DIY situations because causation is contested and the medical issues are nuanced. Consider a lawyer if:

• The aggravation is significant or permanent.
• The adjuster aggressively blames the prior condition.
• The medical causation is genuinely complicated.
• The dollar value is substantial.

A lawyer can marshal medical evidence and expert opinions to prove aggravation. Our [attorney guide](/lawyer) explains when this is worthwhile.

Mind the Deadline

Gathering prior and current records to establish baseline and worsening takes time. Do not let the statute of limitations lapse while you build the documentation. See our [statute of limitations overview](/statute).

Bottom Line

A pre-existing condition does not end your claim. Under the aggravation and eggshell rules, you can recover for how the accident worsened your condition. Disclose the condition honestly, establish a clear baseline, document the worsening, and get a strong causation opinion from your doctor. Bound your claim to the aggravation and you can recover fairly even with a prior injury. For more, see our [FAQ](/faq).