Proving What Changed Without Hiding the Health History
A previous injury does not automatically eliminate a Texas car accident claim. The important questions are the person's baseline, what the crash caused or aggravated, and what evidence supports that change. A complete history helps distinguish a legitimate aggravation from an unsupported claim that every finding is new.
Establish the actual baseline
Obtain relevant prior records and ask about symptoms, treatment, restrictions, and everyday function before the crash. A diagnosis from years earlier may have little ongoing effect, or it may explain an important part of the current condition. The label alone does not answer that question.
For clients, tell counsel and providers about previous injuries even when they seem resolved. Describe what you could do before this event and what became difficult afterward. Do not guess about medical causes. Your role is to provide an accurate account; qualified providers determine the clinical meaning.
A useful baseline includes work, recreation, sleep, self-care, and assistance needs. The person may have lived independently despite intermittent pain, then required substantial help after the collision. Evidence of function can support an aggravation analysis without pretending the prior condition did not exist.
Build the postcrash chronology
Record symptom onset, first evaluation, diagnostic studies, referrals, treatment, improvement, setbacks, and later incidents. Identify any inconsistent history given to providers. Correcting an incomplete history promptly is better than discovering it during cross-examination.
Medical causation may require qualified testimony when the relationship is beyond ordinary understanding. Ask the physician to explain the mechanism, clinical findings, timing, baseline, and alternative causes within the physician's expertise. A statement that pain followed a collision may be relevant but does not always resolve a complex condition.
Imaging findings should be interpreted in context. Degenerative changes do not automatically establish that the crash caused nothing, and a disc finding does not automatically establish a traumatic cause. The opinion needs reasoning supported by the records and examination.
Address later accidents directly
In JLG Trucking v. Garza, the Texas Supreme Court held that subsequent-collision evidence was relevant to the central causation dispute and that its exclusion, including restrictions on expert cross-examination, was harmful. Counsel should prepare the medical expert with the complete material history rather than assume an alternative cause can be kept outside the case.
An illustrative patient may report neck symptoms after one crash and undergo imaging after a second. Determine what was documented between the events, what changed after each, and what the physician can reliably attribute. The analysis may support one event, aggravation by another, or uncertainty. It should not choose an answer before the history is reviewed.
For practitioners, organize alternative causes by date, anatomical region, symptoms, and relevance. A broad production of unrelated medical material may raise proportionality or privacy issues, while material history should not be concealed. Seek appropriate limits without preventing legitimate evaluation.
Explain treatment gaps honestly
A gap may reflect improvement, cost, access, transportation, scheduling, or another genuine reason. Preserve supporting communications when they exist. Do not invent an explanation or treat every missed visit as legally insignificant.
Distinguish no treatment record from no symptoms. Contemporaneous messages, work changes, pharmacy records, or observations may help, but they require careful evaluation. A later recollection should remain identified as a recollection rather than be presented as a contemporaneous medical finding.
Clients should follow appropriate medical advice rather than pursue procedures to increase case value. Report improvements and continuing difficulties. A truthful recovery course can support a meaningful claim without overstating permanence.
Questions clients often ask
Does arthritis mean I cannot recover?
No automatic rule eliminates a claim based on that diagnosis. Counsel must evaluate whether the event caused or aggravated a supported condition and loss.
Should I leave an old injury out of the intake?
No. An incomplete history can harm credibility and expert analysis. Explain its actual relevance rather than hiding it.
Does a billing affidavit prove the crash caused my injury?
No. Section 18.001 distinguishes expense proof from causation. Medical causation requires its own support.
Medical causation is an explanation rather than a label
An imaging finding can establish anatomy without establishing when or why the condition became symptomatic. A physician should explain the relevant clinical history, examination, symptom progression, testing, mechanism, and plausible alternatives. A conclusion that everything followed the crash may be accurate, but chronology alone does not resolve every complex condition. Texas Rule of Evidence 702 and the causation decisions require attention to the reasoning connecting the evidence to the opinion.
Guevara v. Ferrer, 247 S.W.3d 662 (Tex. 2007), distinguishes matters that can be supported through lay evidence from conditions requiring expert medical causation proof. Its application depends on the injury and the record. Counsel should not treat the case as allowing any diagnosis to be proved through temporal proximity. Equally, not every simple observed consequence requires the most elaborate expert plan. Identify what is within ordinary experience and what depends on specialized knowledge.
JLG Trucking LLC v. Garza, 466 S.W.3d 157 (Tex. 2015), emphasizes the importance of relevant subsequent accident evidence and meaningful examination of the causation expert. The preparation lesson is to provide the physician the actual later event records. Saying the later crash was minor without obtaining its treatment record can leave the opinion vulnerable. The plaintiff retains the burden to connect the claimed injury to the event at issue.
Establish a functional baseline before assigning damages
Ask what the person could do before the crash, how often earlier symptoms occurred, what treatment was received, and whether restrictions already existed. A person may have degeneration without significant limitation, or severe limitation with little recent care. The legal file should preserve that distinction. Useful sources include earlier records, work duties, prescription history, ordinary activities, and witnesses who observed function.
Aggravation analysis should identify the change rather than erase the prior condition. Was pain more frequent? Was a new distribution present? Was treatment escalated, work reduced, or a previously manageable condition destabilized? The expert should explain the extent and anticipated duration of the aggravation where the evidence permits. Counsel should consider the appropriate jury instruction and avoid requesting compensation for a baseline loss the defendant did not cause.
Earlier imaging can be particularly useful but should not be interpreted by staff or the client. Obtain actual images where the expert needs them, not only report language. A difference in radiology phrasing does not necessarily establish a newly caused injury. Equipment, technique, reader, and study timing can affect description. The qualified witness should explain whether the comparison has medical significance.
Evaluate treatment gaps with contemporaneous support
Separate missed care from symptom absence. A person can experience pain while lacking transportation or coverage, but counsel needs the actual explanation. Appointment messages, provider instructions, pharmacy records, employer requests, and family observations can clarify the interval. Do not construct a convenient story after an insurer points out a gap. An accurate explanation may involve both improvement and later recurrence.
The opposite problem is overlooking documented recovery. If a client reported being symptom free, ask what that meant and whether it conflicts with the later claim. A statement that one body part improved may coexist with ongoing symptoms elsewhere. A statement of full recovery may be important adverse evidence. Provide the record to the medical expert and discuss its meaning before deposition rather than trying to explain it without clinical input at trial.
For clients, legal preparation should not dictate unnecessary treatment. Follow qualified medical advice, report changes accurately, and seek appropriate help for persistent or new symptoms. A lawyer can organize evidence but should not prescribe a diagnosis or encourage care to enlarge a claim. Credible treatment records reflect healthcare decisions, not a litigation script.
Prepare the clinician for a focused examination
The clinician should have relevant prior and subsequent information, the collision facts needed for the opinion, and a clear description of the disputed condition. Ask what records were reviewed and what additional material could change the conclusion. Establish the basis for distinguishing trauma from degeneration or another event. Avoid questions that merely invite the witness to repeat a causation phrase without explaining it.
For cross-examination of a defense expert, investigate the same issues. Did the expert review images or only reports? Did the analysis consider the patient's documented precrash function? What supports the claim that degeneration explains the present symptoms? A degenerative finding is relevant, but its existence alone may not answer the aggravation question. Test the reasoning instead of assuming a paid defense expert's opinion is necessarily unreliable.
If specialists disagree, define the actual disagreement. They may agree on the diagnosis and differ on causation, or agree on aggravation and differ on duration. A demand and trial presentation should not describe disagreement more broadly than it is. The client benefits when counsel can identify which issue drives risk and which parts of the claim remain supported.
Hypothetical aggravation and later event
A warehouse employee had intermittent neck discomfort before a rear impact but performed full duties. After the crash, documented arm symptoms and restrictions developed. Three months later, a separate collision occurred. The file needs the precrash baseline, the interval before the second event, and the records after it. Those periods permit a physician to consider what changed at each stage instead of assigning every symptom to whichever event appears first on the timeline.
An opinion may support new injury, aggravation, shared contribution, or uncertainty. Counsel should explain the result honestly to the client and tailor damages to what can be proved. At trial, a chronology can identify the dates without replacing the expert's explanation. The law is not served by concealing the second event or making the plaintiff guess which medical change each crash caused.
This work translates directly into client value: it protects a legitimate aggravation claim from an oversimplified preexisting condition defense and avoids an unsupported claim for unrelated losses. Ask Aaron Herbert's firm how it will obtain the relevant history, select necessary expertise, and present the causal explanation if the insurer disputes it. Trial preparation matters because the opinion must remain understandable and defensible under examination.
Establish a complete medical chronology
Medical causation is the connection between the crash and the condition or aggravation for which damages are sought. Treatment records may document symptoms and diagnosis, but their existence does not automatically establish that every condition was caused by the collision. The analysis should address onset, mechanism, baseline health, progression, clinical findings, and plausible alternative explanations.
Build a chronology from records rather than from memory alone. Include relevant pre-crash complaints, the first post-crash encounter, later examinations, diagnostic studies, prescriptions, referrals, therapy, procedures, restrictions, and subsequent events. Identify when symptoms first appear in the documentation and whether different providers received consistent histories. A chronology can reveal both a strong causal connection and a gap requiring further explanation.
Ask the client about previous injuries before the defense does. A prior complaint may be remote, resolved, intermittent, or directly relevant. The important question is what the person's condition and function were before this crash. A history of back pain does not prove the current impairment is unrelated, but concealing the history can undermine an otherwise legitimate aggravation claim.
Qualified medical opinions may be needed where the causal relationship is beyond ordinary understanding. The physician should review the relevant history and explain the reasoning, not merely repeat that symptoms began after a crash. When imaging shows degenerative changes, ask how the findings relate to the patient's symptoms, examination, prior function, and the mechanism described. Avoid treating an imaging label as a complete causal answer.
Later accidents and alternative causes require direct attention. In JLG Trucking v. Garza, the Texas Supreme Court addressed the harmful exclusion of evidence of a subsequent crash relevant to injury causation, including cross-examination of the plaintiff's expert. The practical lesson is to prepare the expert with the complete material history and analyze relevance and admissibility carefully. JLG Trucking LLC v Garza 466 SW3d 157 Tex 2015
For clients, accuracy is more helpful than describing everything as new. Tell treating providers and counsel what was present before the crash, what changed, and what has happened since. If a symptom improves or resolves, report that too. A claim can remain meaningful even when recovery is incomplete rather than permanent, and a truthful record supports a sound evaluation.
Explain treatment gaps without manufacturing a story
A gap in treatment can have many causes: lack of insurance, transportation problems, appointment availability, work demands, improvement, fear, or misunderstanding about follow-up. It can also support a legitimate question about the severity or continuity of symptoms. Counsel should identify the actual explanation and supporting information rather than assume the gap is harmless or fatal.
A patient should make medical decisions with qualified providers. The legal claim should not determine whether unnecessary treatment is pursued. When symptoms persist, a provider can assess the appropriate follow-up. If a person could not attend an appointment, preserving scheduling messages, transportation information, or insurance correspondence may help explain the chronology without changing the underlying medical facts.
For practitioners, record the distinction between no documented visit and no symptoms. A person may have symptoms during a period without care, but that assertion needs credible support. Messages to a provider, contemporaneous family observations, workplace limitations, or pharmacy records may help. Those sources should be evaluated for reliability and consistency rather than collected only because they sound favorable.
Avoid instructing a client to use a particular diagnosis or blame phrase. Ask for concrete experiences: how long the person can sit, what activity causes difficulty, whether sleep changed, or whether a task now takes longer. The provider determines the diagnosis and medical significance. A legal interview should document the patient's account without turning it into a scripted clinical conclusion.
The defense may rely on missed appointments, incomplete therapy, or inconsistent reports. Prepare by understanding the facts and considering whether the disagreement affects causation, mitigation, or credibility. Different issues may call for different evidence. A missed appointment because the clinic rescheduled it presents a different concern from stopping care after reporting complete improvement.
For clients, keep reasonable notes about symptoms and function, but do not build an exaggerated daily record for litigation. Include progress as well as difficulties. A balanced account that explains what remains limited is often more credible than identical descriptions of extreme pain repeated every day. Counsel can help determine what records are useful without directing treatment.
Develop future care from prognosis rather than possibility
Future medical expenses require a supported projection of care the person is reasonably likely to need because of the injury. A list of all procedures that could theoretically occur does not establish a credible plan. The analysis should connect diagnosis and prognosis to the type, timing, frequency, duration, and cost of proposed services.
The treating physician may explain likely follow-up, medication, therapy, injections, revision procedures, or surgery. The level of certainty matters. Distinguish a recommendation currently made from an option that would be considered if symptoms change. Counsel should understand that distinction before describing a procedure as inevitable in a demand or mediation presentation.
For serious permanent injuries, a life-care planner can organize future needs when supported by appropriate medical input. Other experts may address cost, vocational impact, or economic calculations. The file should identify which expert supplies each assumption. A life-care plan cannot cure an unsupported medical premise simply by assigning prices to it.
Avoid double counting. Transportation, attendant services, therapy, and household assistance may overlap if several experts include the same need under different labels. Check whether an item is already included in another category or applies only during a particular recovery period. A clear explanation of frequency and duration is more useful than a large total with uncertain components.
For the client, ask what the doctor expects, what remains uncertain, and what decisions are likely to be required. A final settlement often ends the injury claim even if future care becomes more expensive. That makes prognosis information important before release. It does not mean delaying every settlement until perfect certainty, which may be impossible; it means evaluating the uncertainty knowingly.
An illustrative future-care analysis could distinguish a supported year of therapy from a contingent surgery. The negotiation may account for the contingent risk, but the presentation should explain its medical basis and uncertainty. Counsel can develop a range of supported scenarios rather than describing every scenario as certain. That approach helps the client weigh settlement against litigation risk.
Prepare experts and challenge opinions on their merits
An expert's usefulness depends on qualifications, reliable reasoning, sufficient facts, and a connection to the disputed question. The expert should receive the necessary information, including material that complicates the preferred theory. Counsel should understand the method well enough to identify assumptions, limits, and questions likely to arise in cross-examination.
Plan disclosures and reports around the scheduling order and applicable rules. A strong substantive opinion can encounter procedural difficulty if deadlines are missed or the disclosure does not identify its basis adequately. Keep a calendar for each expert and track whether new evidence requires supplementation. Do not treat expert preparation as a task to begin only after mediation fails.
For medical experts, identify the condition, causal reasoning, baseline, alternative causes, treatment necessity, prognosis, and restrictions within the witness's expertise. For reconstruction experts, identify inputs, measurements, uncertainties, and competing scenarios. For economic experts, identify the underlying medical and vocational assumptions. Consistency across opinions is essential, but consistency should come from shared facts rather than coordinated exaggeration.
An opposing opinion should be tested through its actual reasoning. Determine what records were reviewed, what information was omitted, whether the method fits the case, and whether conclusions exceed the inputs. A disagreement alone does not make an opinion inadmissible. A focused challenge should distinguish a flaw in reliability from an issue that is properly addressed through cross-examination.
Clients can help by reporting additional treatment, employment changes, or later incidents promptly. An expert who works from an outdated chronology may be surprised by information the client thought was insignificant. Timely updates allow the opinion to be evaluated and supplemented appropriately. The lawyer should explain which developments are important and provide a manageable way to report them.
Expert expenses should remain proportionate to the issues and practical recovery. Some cases need several disciplines; others can be developed effectively with fewer. Explain why a proposed expert is needed, what question the expert will answer, and how the expense affects the client. A larger team is not automatically a better strategy.
How specialized trial preparation can help your claim
The legal work described here matters because it helps the firm evaluate prior conditions and injury causation. It can preserve a useful source, identify an unsupported insurer position, or reveal a genuine risk before you make an irreversible decision. It also provides a plan for presenting the issue through admissible evidence if settlement does not resolve it.
Aaron A. Herbert is Board Certified in Personal Injury Trial Law by the Texas Board of Legal Specialization. The firm's published background describes substantial jury trial experience, and its case results report significant client recoveries. Review those credentials and results alongside the investigation your own case requires. Previous outcomes do not guarantee a similar result; the facts, proof, law, and available recovery sources differ.
If you are considering hiring counsel after a Texas crash, request a free consultation with The Law Firm of Aaron A. Herbert PC or call 214 200 4878. Tell the office about the issue addressed in this article and any approaching deadline. Ask who would handle the case, what work is needed, and how fees and expenses are addressed before signing an agreement.
Attorneys and referral partners can use the same contact page to request a case or litigation discussion. Identify procedural dates and confirm acceptance before transferring responsibility. Representation begins only when the firm accepts the matter.
Read the Texas car accident claims and litigation guide or return to the Texas Car Accident Knowledge Hub for related resources.
Related car accident resources
- Medical Bills and Future Care After a Texas Car Accident
- Serious and Catastrophic Car Accident Injuries in Texas
- Evaluating a Texas Car Accident Settlement Offer (Coming soon)
Legal sources
JLG Trucking LLC v Garza 466 SW3d 157 Tex 2015.
JLG Trucking LLC v Garza discussing Guevara and medical causation.
Texas Rules of Civil Procedure effective October 1 2026.
This article provides general information about Texas law. Application depends on the facts, policy, court orders, and law governing the particular claim. Hypothetical examples are illustrations rather than reported firm cases.
ABOUT THE ATTORNEY
Aaron A. Herbert
Founding Attorney
Board Certified in Personal Injury Trial Law
Aaron founded The Law Firm of Aaron A. Herbert in 2010 to focus on developing each client's case and seeking its maximum value. For over a decade, he has represented people seriously injured in major accidents and industrial catastrophes, pursuing trial verdicts and settlements while working to reduce the stress of litigation.
Education
- Texas A&M University · B.S., Criminal Justice, 1999
- University of Oklahoma College of Law · J.D., 2002; graduated in the top of his class
Trial experience & approach
Aaron earned numerous jury verdicts at boutique personal injury litigation firms. According to his biography, he spent a year as the top-earning litigation attorney at a firm that frequently appeared in verdict searches as having one of the highest numbers of trial wins in Texas. At another Dallas personal injury firm, he moved from managing pre-litigation attorney to managing litigation attorney over seven years as the firm grew into one of Dallas's largest personal injury firms.
His biography describes a reputation as one of America's most aggressive trial lawyers, with noteworthy recoveries from judges and juries and substantial pretrial settlements. Most of those settlements included confidentiality agreements requested by the defense. Aaron has said the recoveries were justified by the injuries and losses involved, which no amount of money could make someone choose to experience.
His approach combines passion, preparation, persistence and courtroom imagination. He believes a well-supported, engaged and motivated team working cooperatively helps deliver strong representation, with the goal of achieving the best possible result for every client.
Dallas roots, military service & publication
Born and raised in Dallas, Aaron enlisted in the United States Marine Corps after high school and later received an Honorable Discharge. He completed his university and law degrees after his military service and became a lifelong Sooners football fan in law school.
Publication: “Litigating Dog Bite Cases,” Texas Dog Law Seminar, Dallas, 2009.
Professional affiliations & recognition
Professional affiliations and recognition listed in Aaron’s biography:
- State Bar of Texas
- American Bar Association
- Association of Trial Lawyers of America (now American Association for Justice)
- Texas Trial Lawyers Association
- Dallas Trial Lawyers Association
- Dallas Bar Association
- Tarrant County Bar Association
- Million Dollar Advocates Forum
- The National Trial Lawyers – Top 100 Trial Lawyers
Trial experience & approach
Aaron earned numerous jury verdicts at boutique personal injury litigation firms. According to his biography, he spent a year as the top-earning litigation attorney at a firm that frequently appeared in verdict searches as having one of the highest numbers of trial wins in Texas. At another Dallas personal injury firm, he moved from managing pre-litigation attorney to managing litigation attorney over seven years as the firm grew into one of Dallas's largest personal injury firms.
His biography describes a reputation as one of America's most aggressive trial lawyers, with noteworthy recoveries from judges and juries and substantial pretrial settlements. Most of those settlements included confidentiality agreements requested by the defense. Aaron has said the recoveries were justified by the injuries and losses involved, which no amount of money could make someone choose to experience.
His approach combines passion, preparation, persistence and courtroom imagination. He believes a well-supported, engaged and motivated team working cooperatively helps deliver strong representation, with the goal of achieving the best possible result for every client.
Dallas roots, military service & publication
Born and raised in Dallas, Aaron enlisted in the United States Marine Corps after high school and later received an Honorable Discharge. He completed his university and law degrees after his military service and became a lifelong Sooners football fan in law school.
Publication: “Litigating Dog Bite Cases,” Texas Dog Law Seminar, Dallas, 2009.
Professional affiliations & recognition
Professional affiliations and recognition listed in Aaron’s biography:
- State Bar of Texas
- American Bar Association
- Association of Trial Lawyers of America (now American Association for Justice)
- Texas Trial Lawyers Association
- Dallas Trial Lawyers Association
- Dallas Bar Association
- Tarrant County Bar Association
- Million Dollar Advocates Forum
- The National Trial Lawyers – Top 100 Trial Lawyers