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How Pre-Existing Injuries Affect Your Car Accident Claim

LEGALLY REVIEWED BY:
Callahan & Blaine
June 4, 2026

Two drivers standing outside their vehicles after a car accident on a road

A prior injury should never disqualify you from receiving compensation after a car accident. Insurance companies and defense attorneys frequently use a victim’s medical history as a weapon, arguing that the pain you are experiencing today existed long before the collision. Understanding how pre-existing conditions factor into your claim is essential to protecting the full value of what you are owed.

At Callahan & Blaine, PC, our personal injury attorneys have spent over 40 years representing seriously injured individuals throughout Southern California. Our firm of 29 trial attorneys understands insurers’ tactics to minimize payouts, and we are prepared to push back aggressively on our clients’ behalf. If a car accident has worsened a condition you were already managing, you have every right to pursue compensation for that aggravation.

What “Pre-Existing Condition” Means in a Claim

When an insurance adjuster or defense attorney refers to a pre-existing condition, they mean any injury, illness, or physical vulnerability that existed before the accident at issue. This can include prior back or neck injuries, degenerative disc disease, arthritis, a prior fracture, or even a history of headaches or chronic pain.

The existence of a prior condition does not mean a defendant escapes liability for making it worse. What matters legally is whether the accident aggravated or accelerated your condition beyond what would have occurred on its own.

Aggravation vs. Pre-Existing Damage

Courts in California and throughout the country draw a clear distinction between an injury that existed before a crash and the worsening of that injury caused by the crash. If your lower back was managing well before a rear-end collision left you unable to work, the accident caused a compensable harm regardless of your prior history. Proving that distinction requires detailed medical documentation and a clear narrative connecting the collision to the change in your condition.

The Eggshell Plaintiff Rule and Why It Matters

One of the most important legal principles in personal injury law is the eggshell skull rule, which Cornell Law’s Legal Information Institute explains as a doctrine holding a defendant liable for the full extent of a plaintiff’s harm, no matter how severe, as long as the injury was proximately caused by the defendant’s wrongful act. In other words, the at-fault driver must take you as they find you. If your body was more vulnerable to injury because of a prior condition, that is not your fault, and it does not reduce what you are entitled to recover.

This rule is particularly relevant in catastrophic injury cases, where a seemingly moderate collision produces devastating outcomes for a person with an underlying vulnerability. The rule exists specifically to prevent defendants from escaping the full consequences of their negligence simply because the victim was not in perfect health.

How Insurance Companies Use Your Medical History Against You

After a car accident, one of the first things an insurance adjuster will do is request your full medical records. They are looking for any prior treatment related to the injured area of your body. If they find it, they will attempt to argue that your current pain is not the result of the accident at all. This approach is commonly used to reduce settlement offers, deny claims outright, or shift blame onto your own health history.

The following tactics are frequently used to devalue claims involving pre-existing conditions:

  • Arguing that imaging results reflect prior degeneration, not acute trauma from the accident
  • Claiming that treatment costs are attributable to the old condition rather than the new injury
  • Misrepresenting medical records to suggest the collision caused no change in your condition
  • Requesting independent medical examinations designed to minimize your reported symptoms

These tactics are often misleading, and an experienced legal team can identify and counter them with proper medical documentation and expert testimony.

Building a Strong Claim Despite a Prior Injury

The foundation of a successful claim involving pre-existing conditions is thorough medical documentation. Your treating physicians need to clearly establish your baseline condition before the accident and the measurable change that occurred afterward. Records from before the accident, imaging studies taken immediately after the collision, and consistent follow-up treatment all contribute to a compelling record of aggravation.

In cases involving spinal cord injuries, the difference between a manageable pre-existing disc issue and a post-collision herniation requiring surgery can represent hundreds of thousands of dollars in damages. The medical record must tell that story clearly and without ambiguity.

Contact Callahan & Blaine, PC to Submit Your Potential Case Regardless of Your Pre-Existing Injury

If you have a prior injury and were hurt in a car accident, do not assume your medical history will prevent you from recovering fair compensation. The personal injury attorneys at Callahan & Blaine, PC have the courtroom experience and legal knowledge to handle complex claims involving pre-existing conditions. Our record includes the largest jury verdict in Orange County history, and we bring that level of commitment to every case we take on.

Reach out to us today so we can evaluate what happened to you. To submit your potential case, visit our contact page, and a member of our team will follow up with you promptly.

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Legally reviewed by:
Callahan & Blaine
June 4, 2026

Callahan & Blaine, established in 1984, is a leading litigation firm with a legacy of delivering exceptional results for our clients. With over 700 years of combined trial experience and a proven track record of more than $1 billion in verdicts and settlements, our team of highly recognized attorneys specialize in handling complex and high-stakes civil cases with unparalleled efficiency and skill.

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