Pre-Existing Injuries in Car Accidents: How Do They Impact a Claim?

Can You Recover Compensation With a Pre-Existing Condition?

Yes.

You may recover compensation when a car accident worsens a pre-existing injury, illness, or degenerative condition.

The claim may include increased pain, new physical limitations, additional medical treatment, surgery, lost income, reduced earning capacity, and other losses caused by the aggravation.

You generally cannot recover for the condition as it existed before the collision.

The amount of compensation depends on the difference between your health and functioning before the crash and your condition afterward.

Medical records, imaging, treatment history, and physician opinions can help establish that change and support a claim for full compensation under the applicable law.

Health insurance plans may pay some medical expenses while the claim is pending, but health coverage does not eliminate the at-fault party’s potential responsibility for accident-related damages.

How Pre-Existing Conditions Affect a Car Accident Claim

A pre-existing condition is an injury, illness, degenerative condition, or medical limitation that existed before the car wreck.

Its effect on the claim depends on whether the collision caused a new injury, worsened the existing condition, or activated a condition that had previously caused no symptoms.

The significance of pre-existing conditions is determined by evidence comparing the claimant’s health and functioning before and after the accident.

Relevant evidence may include:

• Prior diagnoses and symptoms: Earlier records can show whether the affected body part was painful, stable, improving, or asymptomatic before the crash.
• Changes after the collision: New pain, reduced mobility, neurological symptoms, additional treatment, or new work restrictions may demonstrate aggravation.
• Diagnostic testing: Pre- and post-accident imaging can help identify new findings or changes in an existing condition.
• Treatment history: A sudden need for injections, surgery, medication, or more intensive care may support the connection to the crash.
• Medical opinions: Treating physicians and specialists can explain whether the collision caused or worsened the claimed injury.
• Unrelated medical conditions: Diagnoses such as diabetes or cancer may appear in all your medical records but may have little relevance unless they affected the injury, treatment, or recovery.

An insurance company may request medical records to investigate causation, but the scope of the request should generally relate to the conditions and injuries at issue. Payments made through a health plan do not determine whether the at-fault driver is liable for the accident-related worsening.

The Legal Rule: Eggshell Plaintiff and Aggravation of a Prior Injury

Pre-existing injury claims are governed by well-established personal injury principles that distinguish between a person’s underlying medical condition and the additional harm caused by a collision.

The law does not prevent someone from recovering compensation simply because they were more susceptible to injury before the accident.

Instead, the injured person must show that the crash caused a new injury or measurably worsened an existing one.

Medical records, diagnostic imaging, treatment history, and detailed opinions from treating physicians often play a central role in proving that connection.

Even when a claimant had prior health problems or received medical attention before the collision, the at-fault party may still be responsible for the accident-related worsening.

The Eggshell Plaintiff Rule

The eggshell skull rule, often called the eggshell plaintiff rule, provides that a negligent driver generally takes an injured person as they find them.

If someone is more vulnerable to injury because of age, prior trauma, a degenerative condition, or another medical issue, the at-fault party cannot avoid liability simply because another person might have suffered a less serious injury under the same circumstances.

The rule does not eliminate the need to prove medical causation.

The injured person must still establish that the collision caused a new injury or aggravated an existing condition.

Once that connection is established, the defendant may be responsible for the full extent of the accident-related harm, even if the claimant was unusually susceptible to injury.

Aggravation of a Pre-Existing Condition

An aggravation occurs when a car accident makes a pre-existing condition worse.

The worsening may include increased pain, reduced mobility, new neurological symptoms, additional medical attention, permanent physical restrictions, or the need for surgery or other treatment that was not required before the collision.

The law generally allows compensation for the additional harm caused by the accident, not for the underlying condition itself.

The goal is to identify the measurable difference between the claimant’s condition before the crash and afterward, including any new medical expenses, lost income, or long-term limitations resulting from the aggravation.

Depending on the available insurance coverage, damages may also cover treatment that became necessary because the collision worsened the existing condition.

New Injury, Aggravated Injury, or Unrelated Flare-Up

One of the most common disputes in pre-existing injury claims is whether the claimant suffered a new injury, an aggravation of an existing condition, or symptoms that are unrelated to the collision.

Medical evidence often determines which category applies, making the timing of symptoms, diagnostic testing, treatment records, and physician opinions especially important.

The following distinctions are often central to determining whether a pre-existing injury claim is compensable:

• New Injury: Harm that did not exist before the collision, such as a new fracture, concussion, torn ligament, or acute soft-tissue injury.
• Aggravated Injury: A pre-existing condition that became measurably worse because of the crash, such as previously manageable degenerative disc disease that becomes painful, symptomatic, or requires surgery after the collision.
• Unrelated Flare-Up: Symptoms that would have developed regardless of the accident because of the natural progression of an underlying condition rather than trauma from the collision.

Insurance companies often argue that ongoing symptoms are the result of ordinary degeneration or unrelated medical issues instead of the crash.

Comparing medical records from before and after the collision, along with imaging studies, symptom timelines, and physician opinions, can help establish whether the accident caused a measurable worsening.

How Insurance Companies Evaluate a Pre-Existing Injury Claim After a Car Accident

Insurance companies evaluate a pre-existing injury car accident claim by examining medical causation, liability, damages and the extent to which the motor vehicle accident aggravated a prior injury or existing medical condition.

The adjuster usually builds a chronology of treatment before and after the car accident to decide whether the claim involves a new injury, an aggravation of an earlier injury, or a continuation of an underlying condition.

Insurance adjusters commonly review the following evidence when valuing a bodily injury claim involving a previous injury:

• Chronology of treatment: Adjusters compare the timing of prior symptoms, car accident complaints, referrals, imaging, injections, surgery recommendations, and maximum medical improvement.
• Gaps in treatment: Long gaps before or after the car accident may be used to dispute medical causation, even when there are legitimate reasons for delayed care.
• Prior imaging: Earlier MRI, CT and X-ray studies may be compared against post-accident imaging to identify new findings, worsening degeneration, spinal stenosis, or nerve compression.
• Prescription history: Medication changes after the collision can show increased pain, inflammation, muscle spasms, anxiety, or sleep disruption.
• Employment records: Missed work, reduced hours, modified duty, disability paperwork, and vocational rehabilitation records can show functional limitations.
• Independent Medical Examination (IME) findings: An independent medical examiner may dispute causation, impairment rating, disability rating, future medical expenses, or the need for additional treatment.
• Surveillance and social media: Insurers may review public posts or conduct surveillance to argue that reported restrictions are inconsistent with observed activity.
• Prior settlements or lawsuits: Earlier bodily injury claims, workers’ compensation claims, or personal injury lawsuits may be reviewed for overlapping symptoms, liens, or subrogation issues.
• Reserve value: The insurer may set an internal reserve based on liability, causation, damages, policy limits and the risk of litigation.

A strong demand package addresses these issues directly with medical records, treating physician opinions, diagnostic testing, employment documentation, accident reconstruction evidence when liability is disputed, and a clear explanation of how the car accident changed the claimant’s condition.

How Insurance Companies Use Medical History to Reduce Claims

Insurers often treat pre-existing conditions as a valuation defense.

Their goal is to attribute as much of the current pain, treatment and disability as possible to the past rather than to the collision.

Insurance companies use the following tactics to reduce the value of a personal injury claim:

• Blaming the old injury: The adjuster argues that current symptoms are simply a continuation of prior pain.
• Requesting broad medical authorizations: A blanket authorization may let the insurer search years of unrelated records for damaging statements or unrelated conditions.
• Using an insurer-selected medical exam: An independent medical examination, often called an IME, may produce an opinion minimizing causation or treatment needs.
• Taking statements out of context: Comments such as “my back has always bothered me before” may be used to imply nothing changed after the crash.
• Making quick settlement offers: Early offers may arrive before the full extent of the aggravation, future treatment, or permanent limitations is known.
• Relying on degenerative findings: Imaging may show age-related changes, and insurers may argue those findings explain all symptoms unless medical evidence distinguishes degeneration from crash-related aggravation.

These defenses can be rebutted.

The strongest responses usually come from consistent medical records, diagnostic imaging, treating physician opinions, documented functional changes, and a clear timeline of symptoms.

What Medical Records and Diagnostic Tests Help Prove a Pre-Existing Injury Claim?

Medical records and diagnostic tests help prove a pre-existing injury claim by showing the claimant’s baseline condition before the car accident and the measurable change afterward.

Medical-record disputes are common because insurers need relevant records to evaluate causation, while claimants have an interest in limiting unrelated medical history.

The most important records usually concern the same body part, symptoms, diagnosis, treatment period, functional impairment, or accident-related aggravation at issue in the insurance claim.

Diagnostic tests and records used to prove a pre-existing condition claim include:

• MRI Reports: These can show herniated discs, bulging discs, spinal stenosis, nerve compression, soft-tissue injury, and post-crash changes.
• CT scans and X-rays: These can document fractures, alignment issues, hardware, degenerative findings, and acute traumatic changes.
• EMG and nerve conduction studies: These tests may help evaluate cervical radiculopathy, lumbar radiculopathy, nerve damage, numbness, tingling, or weakness.
• Operative notes: Surgical records can explain what the surgeon found, what procedure was performed, and whether the condition appeared acute, chronic, or aggravated.
• Physical therapy records: These document range-of-motion testing, strength deficits, functional limitations, progress, setbacks, and compliance with treatment.
• Physician notes: Treating physician records often contain the most important opinions on symptom onset, medical causation, restrictions, prognosis and future care.
• Functional capacity evaluations: These can assess work restrictions, endurance, lifting limits, mobility and loss of earning capacity.

Compensation in Car Accident Cases Involving Pre-Existing Injuries

There is no reliable average car accident settlement for a pre-existing injury car accident claim because every claim depends on medical evidence, insurance coverage, state law, and the extent of the accident-related worsening.

A case involving temporary soreness will be valued differently from a case involving surgery, permanent impairment, or loss of earning capacity.

Settlement value usually depends on:

• Severity of the aggravation: More serious worsening usually increases value, especially when symptoms become chronic or disabling.
• Permanent impairment: An impairment rating or disability rating may support more serious damages when the crash caused lasting restrictions.
• Surgery or injections: Epidural steroid injections, facet joint injections, orthopedic surgery, neurosurgery, or fusion surgery can materially affect valuation.
• Future medical costs: Future care, medication, therapy, injections, assistive devices, and life-care planning may increase damages.
• Lost wages and earning capacity: Missed work, reduced hours, job changes, and vocational limitations can increase economic damages.
• Comparative fault: The claimant’s share of fault may reduce recovery in many states and may bar recovery in contributory negligence jurisdictions.
• Insurance limits: Liability insurance, UM/UIM coverage, MedPay, PIP and umbrella coverage may affect the practical amount available.
• Credibility and consistency: Consistent treatment, accurate disclosure and reliable symptom reporting strengthen valuation.

How State Law Affects Pre-Existing Injury Claims

Pre-existing injury claims are governed primarily by state law.

The same medical facts can produce different legal outcomes depending on where the accident occurred, which insurance system applies, and how the state allocated fault.

State law that may impact a case includes:

• At-fault and no-fault systems: In at-fault states, the injured person generally pursues the negligent driver. In no-fault states, the injured person may first use personal injury protection coverage, and additional claims may depend on statutory thresholds.
• Comparative and contributory negligence: Many states reduce recovery by the injured person’s percentage of fault. A small number of jurisdictions apply contributory negligence rules that can bar recovery if the claimant is partially at fault.
• Statute of limitations: Every state sets a deadline for filing a case. Missing the applicable deadline can end the claim even if the medical evidence is strong.
• Damages rules: State law may affect available non-economic damages, punitive damages, collateral-source issues, liens and medical expense proof.
• Insurance coverage rules: Minimum limits, uninsured or underinsured motorist coverage, stacking, medical payments coverage, and PIP benefits vary by state and policy.

Because these rules vary, any statement about deadlines, thresholds, or recoverable damages should be confirmed under the law of the state where the accident occurred.

Common Pre-Existing Conditions in Car Accident Claims

Pre-existing condition disputes commonly involve the spine, joints, brain and chronic pain conditions because crashes can worsen vulnerable areas even when the condition existed before impact.

Common pre-existing conditions include:

• Prior back injuries, including herniated or bulging discs
• Prior neck injuries and whiplash
• Degenerative disc disease and spinal stenosis
• Arthritis and other chronic joint conditions
• Prior fractures or orthopedic surgeries
• Previous concussions or traumatic brain injuries
• Chronic pain conditions, including fibromyalgia
• Prior knee, shoulder, hip or wrist injuries
• Pre-existing anxiety, depression, PTSD, or other mental health conditions aggravated by the crash

Aggravation is not limited to physical injuries.

If a collision measurably worsens a psychological condition, that worsening may be part of the claim, subject to state law and appropriate medical documentation.

Evidence Needed to Prove the Accident Worsened a Pre-Existing Injury

The most important evidence shows the before-and-after difference.

A strong claim does not hide the prior condition; it documents what the condition was before the crash and how the crash changed it.

Evidence in these cases may include:

• Prior medical records: These establish baseline symptoms, diagnoses, treatment frequency, restrictions, and whether the condition was stable.
• Post-crash medical records: These show new symptoms, increased pain, reduced function, new diagnoses, and treatment escalation.
• Imaging studies: MRI, CT, X-ray, and other imaging can identify new findings or compare old findings to post-crash changes.
• Treating physician opinions: A treating doctor can explain whether the accident caused or worsened the condition and why.
• Specialist evaluations: Orthopedic surgeons, neurologists, pain specialists, physical medicine specialists, and mental health providers may clarify causation and prognosis.
• Physical therapy and rehabilitation records: These document functional limitations, progress, setbacks, and treatment consistency.
• Medication and prescription records: These may show increased pain management needs after the crash.
• Employment records: Missed work, reduced hours, modified duties, and lost earning capacity can demonstrate the practical impact of the aggravation.
• Witness statements: Family members, coworkers, and friends can describe changes in mobility, activity level, pain behavior, or daily functioning.
• A symptom diary: A dated log can document pain levels, activity limitations, sleep problems, flare-ups and treatment effects over time.

A treating physician’s opinion comparing prior and post-crash records is often more persuasive than a general statement that the accident “made things worse”.

Specific opinions about symptom timing, imaging changes, treatment escalation, and functional decline can directly counter an insurer’s causation defense.

Mistakes to Avoid with a Pre-Existing Condition

Credibility is critical in pre-existing injury claims.

The following mistakes can give insurers arguments that are difficult to undo:

• Hiding the prior condition: If the insurer discovers an undisclosed injury, the credibility problem may become more damaging than the injury itself.
• Signing a blanket medical authorization. A broad release may give the insurer access to unrelated records that do not fairly bear on the claim.
• Giving a recorded statement without preparation: Casual or incomplete statements about prior pain can be used against the claimant.
• Delaying medical care: Gaps between the crash and treatment create room for causation disputes.
• Skipping appointments or ignoring treatment recommendations: Missed care can be characterized as evidence that the injury is not serious.
• Exaggerating symptoms: Overstatement can undermine the entire claim, especially when prior records are detailed.
• Posting about activities online: Social media posts may be used to argue that the claimant’s limitations are not as severe as reported.
• Accepting the first offer: Early settlements may not account for delayed diagnoses, future treatment, or permanent limitations.

What to Do After a Car Accident With a Pre-Existing Injury

Seek immediate medical attention after a car accident, even if the symptoms initially seem minor or resemble an older condition.

Insurance companies may argue that the injuries were pre-existing rather than accident-related, so early medical documentation can help establish when the symptoms changed.

You may still claim compensation for the aggravation of a pre-existing condition when the evidence shows that the collision caused measurable additional harm.

The following actions can help protect your health and support your claim:

• Explain your medical history accurately: Tell your healthcare providers about the prior condition and clearly describe any new pain, limitations, or symptoms that appeared or worsened after the crash.
• Document functional changes: Record changes in mobility, sleep, work capacity, household responsibilities, and other daily activities, not only changes in pain levels.
• Follow the treatment plan: Attend appointments, complete recommended therapy, take prescribed medication, and avoid unexplained gaps in care.
• Preserve medical evidence: Save medical records, imaging, bills, prescriptions, discharge papers, referral notes, and written work restrictions.
• Keep a symptom diary: Maintain a dated record of symptoms, treatment effects, flare-ups, and activity limitations.
• Preserve accident evidence: Keep photographs, witness information, the crash report, vehicle-damage records, and communications with insurers.
• Limit medical authorizations: Avoid giving the insurance company access to your complete medical history when unrelated records are not reasonably relevant to the claim.
• Review settlement offers carefully: Insurance adjusters may offer low settlements by downplaying the accident’s impact or attributing treatment to the prior condition.

Do not resolve the claim before the extent of the aggravation, future treatment needs, and resulting financial losses are reasonably clear.

Hiring an attorney can help navigate complex insurance claims, respond to causation disputes, and evaluate medical-record requests or settlement offers.

A lawyer can also identify the evidence needed to separate the prior condition from the additional harm caused by the collision.

The Legal Process for a Car Accident Case Involving Pre-Existing Injuries

Pre-existing injury claims often require more documentation than straightforward injury claims because the insurer will compare the claimant’s medical history against the post-crash treatment record.

The legal process typically follows these steps:

1. Medical treatment begins: Providers document symptoms, diagnoses, restrictions, and treatment needs.
2. Prior records are collected: Baseline evidence shows the condition before the crash.
3. Post-crash evidence is developed: Imaging, specialist opinions, therapy records, and work records show the extent of the aggravation.
4. Coverage is reviewed: Available insurance may include bodily injury liability, uninsured or underinsured motorist coverage, medical payments coverage, or PIP benefits.
5. A demand is submitted: The claim is presented with evidence of fault, causation, damages, and the accident-related worsening.
6. The insurer responds: The insurer may accept liability, dispute causation, request more records, schedule an IME, or make a lower offer.
7. Negotiation occurs: The parties exchange positions on medical causation, damages, and settlement value.
8. A lawsuit may be filed: If settlement is not appropriate, litigation may be necessary before the statute of limitations expires.
9. Discovery, mediation, settlement or trial follows: The case may resolve through negotiation, mediation, or court proceedings.

How a Car Accident Lawyer Can Help With Your Case

A car accident lawyer can gather medical records, imaging, and physician opinions to show how a collision worsened an earlier injury.

Pre-existing conditions are determined through evidence comparing the victim’s health, symptoms, treatment, and physical limitations before and after the crash.

A good lawyer can respond when an insurer disputes causation, offers inadequate compensation, or claims that policy exclusions or waiting periods limit available benefits.

Legal representation may also be necessary when the insurance company has denied coverage or demands access to unrelated medical records.

An attorney can calculate accident-related medical expenses, lost income, future treatment needs, and other damages tied to the aggravation.

A lawyer can also address concerns about higher premiums while keeping the claim focused on the harm caused by the negligent driver.

TorHoerman Law: Experienced Car Accident Attorneys

A pre-existing condition can make a car accident claim more difficult, but it does not prevent an injured person from seeking compensation for the harm caused by the crash.

The outcome often depends on medical records, physician opinions, insurance coverage, and evidence showing how the collision changed the claimant’s condition.

TorHoerman Law helps car accident victims address causation disputes, respond to insurer arguments, and pursue compensation for accident-related medical treatment, lost income, pain, and long-term limitations.

Contact TorHoerman Law for a free consultation about your car accident claim.

Our attorneys can review your medical history, available insurance coverage, and settlement options, and qualifying cases are handled on a contingency-fee basis.