“Pre-Existing” Is the Most Profitable Word in the Insurance Vocabulary

You prove that an injury worsened a pre-existing condition by showing a change of state. A stable finding with no symptoms became a sensitized system with symptoms after the event. Objective inflammatory markers and recorded loss of function turn that change into evidence.

If you have an injury claim, you will hear it. Somewhere in your history there is a note. Maybe a bad back at twenty-four, a disc bulge seen by chance, or a shoulder that ached one winter. It will be pulled out as proof that the crash changed nothing.

The record request is not just curiosity. It is a hunt for any past mention that lets your current condition be blamed on something else. And the argument only works if nobody looks at the biology.

Watch on YouTube: Proving Causality and The Science of Exacerbation

Is an old scan finding a pre-existing condition?

Here is the difference the argument depends on hiding.

Imaging findings are very common in people with no symptoms at all. Picture a disc bulge on a scan, in someone with full function and no pain. That describes a stable system. It is a finding, not a disease. It was not holding you back. It was not being treated, and it was not going to be, until something changed.

So the real question is not did anything exist before? It is what state was the system in, and what changed it? A stable system that becomes an unstable one has gone through an event. That change is the injury.

Can a low-speed crash cause a real injury?

Energy does not vanish. In a crash it goes somewhere.

When a car frame crumples, it is soaking up the energy of motion. That is what crumple zones are built to do. When a frame does not bend, that energy has not gone away. It has been passed on, and the person inside is where it went.

This is why low car damage is such a weak stand-in for injury to the people inside. It is why the leap “the car looks fine, so you are fine” is not a medical judgment at all. Fast speeding up and slowing down can cause axonal shearing. That is the tiny stretching and tearing of the brain’s long connecting fibers.

You do not need to strike your head to sustain a traumatic brain injury. The speed change alone is enough. What follows is a metabolic (energy) crisis. The hurt nerve tissue cannot get enough energy to repair itself.

How does an injury make a pre-existing condition worse?

Trauma sets off a body-wide cytokine cascade, a flood of signal proteins. TNF-α, IL-6 and IL-1β are chief among them. If it lasts, this drives neuroinflammation (inflammation in the nervous system) and can set up central sensitization. In this state the nervous system itself stays overactive. It turns up pain signals long after the tissue damage has settled.

That last point is the heart of the case for a worsened condition. The metal gets repaired. The nervous system does not always go back to its old setting. Think of a person who had a chance finding and no symptoms. Now they have symptoms and a sensitized nervous system. That is not the same body with an old complaint. Something happened.

The picture often used for this is a match in a gasoline-soaked room. The fuel was there, but it was also inert. The match does not stop mattering just because it was small.

How do you prove aggravation of a pre-existing condition?

Two things turn this from argument into evidence.

Objective inflammatory markers. Recording the cytokine signals associated with the injury shows a real body response, not a memory of one.

Functional failure rather than pain scores. “My back hurts” invites people to brush it off. “I cannot sleep more than three hours” is a measurable loss of function with a believable inflammatory cause. It is far harder to blame on a disc bulge that was silent for a decade. How to document this before an examination

A note on care: a high marker does not lead straight to a legal finding on cause. A skilled expert on the other side will test that link. Inflammatory markers are non-specific. They rise for many reasons. Their value is in a pattern built alongside mechanism (how the injury happened), timeline and function. That is exactly why a single number should never be the whole argument. What a court actually requires

An injured joint also raises the odds of arthritis for decades afterward. That is a different argument from the one the adjuster is making about your imaging. Post-traumatic arthritis, grading scales, and what the knee guidelines say.

Our physician-directed physiotherapy program is built the same way. Every visit is recorded at the time with clock times, settings and the patient’s signature, and progress is measured with the same questionnaire at the start and at each re-check.

Frequently asked questions

Can I claim if I had a prior injury to the same area?

Generally yes — the legal principle is that a defendant takes the plaintiff as found, and aggravation of a pre-existing condition is typically compensable. The medical task is to separate your past baseline from your current state. Your attorney should advise on how this applies in your jurisdiction.

My disc bulge showed on a scan before the accident. Does that end my claim?

Not by itself. Imaging findings are common in people without symptoms. What matters is whether the finding was limiting what you could do before the event. And whether your function and body changed after it.

Can I have a brain injury if I never hit my head?

Yes. Axonal shearing comes from the brain speeding up and slowing down fast inside the skull. A direct hit is not needed.

Why does the insurer keep requesting more records?

Two reasons usually work together. One is the hunt for any past mention that supports a pre-existing argument. The other is delay itself, which raises the money pressure to settle.

What evidence shows an old problem was made worse?

A mix of things. Recorded function before the injury. How it happened and the forces involved. Inflammatory markers after the injury. Objective findings such as diagnostic blocks. And specific, dated losses of function. No single piece carries it alone.

What is considered a pre-existing injury?

Anything in your history from before the event: a bad back at twenty-four, a disc bulge seen on a scan, a shoulder that ached one winter. But a finding is not the same as a condition. A disc bulge in someone with full function and no pain describes a stable system. It was not limiting you and was not being treated. The real question is what state you were in, and what changed it.

What is an aggravated injury?

It is an old finding that an event pushed into a new, worse state. A stable finding with no symptoms becomes a sensitized system with symptoms after the crash. Trauma sets off a cytokine cascade. That can leave the nervous system turning up pain long after the tissue settles. Think of a match in a gasoline-soaked room: the fuel was there, but it was inert until the match.

Can a car accident cause spinal stenosis?

A crash does not build stenosis. The narrowing from thickened ligaments, overgrown facet joints and bulging discs takes years. What a crash does is take a canal that was narrow but quiet and crowd it: a disc pushes further into the space that was left, the tissue swells, and nerves that had just enough room no longer do. Leg pain and heaviness when walking that began after the collision, in someone who walked without trouble before it, is the aggravation pattern and belongs in the record that way. Low back injuries in crashes that barely dented the car and the options before any back operation cover what comes next.

Where is Injury Experts located?

Injury Experts is at 4477 Woodson Rd, Suite 202, St. Louis, MO 63134, next to Lambert International Airport, serving the St. Louis region in Missouri and Illinois. Call (314) 887-5866 or text (314) 886-5902.

Key takeaways

• An imaging finding with no symptoms is a stable system, not a condition.
• Energy the car does not soak up is passed to the person inside.
• Axonal shearing does not require a head strike.
• Central sensitization can last after tissue damage heals.
• Inflammatory markers are non-specific. They belong in a pattern, not alone.

This article is for general education and is not medical or legal advice. It does not create a physician–patient or attorney–client relationship. Questions about causation in your specific claim should be directed to your attorney.

Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine.