Can a Car Accident Aggravate a Pre-Existing Condition?

Yes. A car accident can aggravate a pre-existing medical condition, and having an old injury, arthritis, degenerative disc disease, prior surgery, or another health problem does not automatically prevent you from pursuing an Arizona personal injury claim.

The important question is not simply whether the condition existed before the crash. The question is what changed because of the crash.

Maybe you occasionally had lower back pain before the accident but could work, exercise, sleep normally, and manage the discomfort without regular treatment. After the collision, the pain becomes constant, starts radiating into your leg, or requires physical therapy, injections, or surgery.

That difference can matter medically and legally.

At Perez Law Group, we believe one of the biggest mistakes injured people make is assuming they have no case because an MRI shows an older problem. Insurance companies may focus heavily on words such as “degenerative,” “chronic,” or “pre-existing.” Those words do not answer the most important question: Did the collision make your condition worse?

How Does Arizona Law Treat Pre-Existing Conditions?

Arizona recognizes an important distinction between compensating someone for a condition they already had and compensating them when another person’s negligence makes that condition worse.

The Revised Arizona Jury Instructions published by the State Bar of Arizona address this issue directly. The personal injury damages instruction explains that an injured person is not compensated simply for having a condition before the defendant’s fault. However, if that condition was aggravated or made worse by the defendant’s conduct, compensation may be awarded for the aggravation.

The instructions also recognize that a person may be more susceptible to injury than a normally healthy person.

In practical terms, a negligent driver does not get a free pass because the person they hit had a bad back, an arthritic neck, or a previous injury.

But this does not mean the at-fault driver automatically becomes responsible for every medical problem the injured person has ever experienced. The claim still needs evidence connecting the collision to the worsening of the condition.

What Does “Aggravating” a Condition Actually Mean?

Aggravation does not always mean that a completely new injury appears on an X-ray or MRI.

Sometimes the most important change is functional.

Before the accident, perhaps you had arthritis but could turn your head normally. After the accident, driving becomes painful because you cannot comfortably look over your shoulder.

Perhaps you had an old herniated disc that had not bothered you in years. After a rear-end collision, you begin experiencing significant back pain, numbness, weakness, or radiating pain.

Or perhaps you were already receiving occasional treatment, but after the crash your symptoms become more severe and your doctors recommend additional treatment.

This is why comparing your before-the-crash baseline with your after-the-crash condition can be so important.

For people dealing specifically with disc injuries, our article on whether a minor car accident can cause or aggravate a herniated disc explains why the severity of an injury cannot always be judged from the appearance of the vehicles.

Perez Law Group also addresses this issue in What If My Car Has Little Damage but I Am Seriously Injured?

Common Pre-Existing Conditions That May Become Worse After a Crash

Car accidents may affect people differently depending on their health before the collision. Conditions that can become relevant in an aggravation claim include:

• Arthritis
• Degenerative disc disease
• Previous herniated or bulging discs
• Chronic neck or back pain
• Old fractures
• Previous joint injuries
• Prior spinal or orthopedic surgery
• Earlier concussion or neurological symptoms

Pre-existing spinal degeneration deserves particular attention because degenerative findings are common and do not necessarily tell the complete story about a person’s symptoms.

A systematic review available through the National Library of Medicine’s PubMed database examined pre-existing cervical degeneration and whiplash-associated disorders. The researchers found evidence that certain types of cervical degeneration, particularly facet joint degeneration, were associated with poorer recovery after whiplash, although the findings differed depending on the type of degeneration involved.

That is one reason an MRI report should not be evaluated in isolation. Medical imaging, symptoms, physical examinations, treatment history, and changes in daily function may all be relevant.

The Strongest Evidence Often Comes From Before the Accident

It may sound counterintuitive, but old medical records can sometimes help an aggravation claim rather than hurt it.

Suppose an insurance company obtains a medical record showing that you complained of back pain three years before the collision. The insurer may point to that record and argue that your current symptoms existed all along.

But what do the rest of the records show?

Perhaps you completed treatment three years ago and did not return for back problems until the collision. Perhaps your old pain was mild and localized while your new symptoms include numbness and radiating pain. Perhaps you were working full time without restrictions before the accident and now cannot perform the same physical duties.

Those facts can help establish a timeline.

The goal should not be to hide a pre-existing condition. In our view, that usually creates a bigger credibility problem. The better approach is to document the condition accurately and show what changed.

An Illustrative Example: “I Already Had Arthritis”

Consider a hypothetical Arizona driver with cervical arthritis.

Before the collision, she occasionally experienced mild neck stiffness after a long workday. She had not needed physical therapy for two years, took over-the-counter medication occasionally, worked full time, exercised, and had no difficulty driving.

She is then rear-ended.

Within the following days, she develops significantly increased neck pain, headaches, muscle spasms, and reduced range of motion. She begins physical therapy and later receives additional medical treatment.

An insurer could accurately say that arthritis existed before the collision.

But that is only half of the story.

The more useful comparison is between her actual level of symptoms and function before the collision and her condition afterward. Her medical records, testimony, work history, treatment history, and physician opinions may help establish whether the crash aggravated the underlying condition.

This example is illustrative and is not a description of a specific Perez Law Group client.

What Evidence Can Help Prove That a Crash Made Your Condition Worse?

These cases are often won or lost on documentation. Useful evidence can include pre-accident medical records, post-accident medical records, diagnostic imaging, physician opinions, physical therapy records, prescription history, employment records, testimony from family members or coworkers, and evidence showing changes in activities or physical limitations.

Your own description of symptoms matters too. Instead of simply saying, “My back is worse,” it may be more useful to document specific changes.

For example, before the accident you could sit at your desk for eight hours, but afterward you need to stand every 30 minutes. Before the crash you hiked every weekend, but now walking a mile increases your pain. Before the collision you slept normally, but now pain wakes you several times each night.

Specific comparisons help turn an abstract claim of “aggravation” into something that can be understood.

Perez Law Group’s guide on how to document injuries after an accident provides additional steps for preserving this type of evidence.

Be Careful When Talking to the Insurance Company

Pre-existing condition cases give insurance adjusters an obvious area to investigate.

You may be asked whether you have “ever had back pain before” or whether you have previously received treatment for the same body part. A technically inaccurate answer can later be used to attack your credibility.

That does not mean you should exaggerate your medical history in the opposite direction either.

Be accurate.

There is a major difference between saying, “Yes, I had occasional back pain five years ago,” and allowing an insurer to characterize that statement as proof that your current disabling symptoms have nothing to do with the crash.

If the other driver’s insurer is requesting a recorded statement or asking detailed questions about your medical history, read our guide on whether you should answer questions from the other driver’s insurance company.

Do Not Create an Unnecessary Gap in Treatment

If symptoms become worse after an accident, seek appropriate medical care and explain your history accurately to your healthcare providers.

A long unexplained period without treatment can make it easier for an insurance company to argue that the collision did not cause the change in your condition.

That does not mean every treatment gap destroys a case. There may be legitimate reasons someone could not immediately see a doctor, including cost, transportation, work obligations, scheduling problems, or symptoms that developed gradually.

We discuss those issues in more detail in Can a Gap in Medical Treatment Hurt an Arizona Car Accident Claim? and How Long After a Car Accident Can Injuries Appear?

A Pre-Existing Condition Is Not the End of Your Claim

If you were managing an injury or medical condition before a crash, do not assume that you cannot recover compensation simply because you were not in perfect health.

The real question is what the negligent driver’s actions caused.

At Perez Law Group, PLLC, our attorneys investigate medical history, treatment records, accident evidence, insurance coverage, lost income, and the ways an injury has changed a client’s daily life.

Our selected personal injury case results include substantial recoveries in motor vehicle and other injury cases, although previous results never guarantee the outcome of a future case.

Arizona personal injury lawsuits are also generally subject to a two-year limitation period under A.R.S. § 12-542, although exceptions and different deadlines can apply depending on the circumstances.

If a car accident made an existing injury or medical condition worse, contact an experienced Glendale car accident attorney at Perez Law Group. We serve injured clients in Glendale, Phoenix, and throughout Arizona.

Call (602) 730-7100 to request a consultation. Hablamos Español.