Two accidents with the same symptoms and your compensation

23 September 2026

Arslan Advocaten

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Two accidents with the same symptoms and your compensation

You are recovering from a collision and then have another accident. Your neck pain gets worse, work becomes harder and two insurers point at each other. One claims that your symptoms already existed. The other takes the view that the new limitations belong to the second accident. Meanwhile, your costs keep mounting.

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Written by Onur Arslan, attorney at Arslan Advocaten. Registered in the specialisation register of the Netherlands Bar for employment law and personal injury. Last updated: 17 September 2026.

With two accidents causing the same symptoms, compensation turns on a careful distinction between existing consequences, aggravation and uncertainty about the cause. The damage is not automatically halved. Nor does an earlier accident mean that you no longer have a claim after a second incident.

In brief

Two accidents with the same symptoms first require a liability assessment for each event, and only then a division of the damage.
The key is the situation immediately before the second accident: were you working, playing sport, doing the housework, receiving treatment?
Existing damage and additional damage must be kept apart. Often the issue is the aggravation attributable to the second accident, but not always: if both events cause the same damage that cannot be divided, both parties who caused it may be liable for the whole, and the division only follows between them.
Alternative causation, proportional liability and loss of a chance are different doctrines, each with its own conditions.
A timeline with file references for each event makes the discussion concrete; see also medical causation.

A sound assessment starts with a timeline of symptoms, functioning and damage. It is then examined which legal party is liable for which accident and which consequences can be attributed to it. In this article you will read which information helps with this and why a joint medical assessment is sometimes important.

First establish liability for each accident

Two events do not automatically mean two liable insurers. For each accident, it must be examined what happened, who is legally responsible for it and whether there is insurance cover. A road traffic accident, an accident at work and a fall at home can have very different starting points.

So keep the documents for both incidents separately. Think of claim forms, letters holding parties liable, witness statements and responses from insurers. Note whether liability has been accepted and exactly what that acceptance covers. A payment or acknowledgement of receipt is not always a full acceptance of all consequences.

If the first accident cannot be recovered from another party, that does not automatically make the second party responsible for all existing damage. It must, however, be examined whether the second accident caused additional damage or disrupted recovery. The legal assessment follows the facts, not merely the availability of an insurer.

Reconstructing the situation immediately before the second accident

The most important comparison is often your condition immediately before and after the second incident. Were you already able to work fully again? Had treatment been completed? Were you still in pain, but without limitations in daily activities? Such differences help determine whether there is new damage or a continuation of existing consequences.

Use information recorded at the time. A report from the occupational health physician, a treatment note or a work schedule can clarify a great deal. Messages about resuming sport or studies can also provide support. Stating afterwards that everything was going well is less convincing when earlier files show a different picture.

Being entirely free of symptoms is not a condition for a new claim. Someone can function again with mild residual symptoms and suffer a serious relapse because of a subsequent accident. So do not describe pain scores alone, but also activities, working hours, need for help and capacity. This makes any change easier to verify.

Keeping existing damage and additional damage apart

A first accident may already have caused loss of income or treatment costs. That damage does not disappear because a second accident occurs later. At the same time, the same period of damage must not be compensated in full twice. An overview for each period and each head of damage is therefore essential.

Suppose you were working twenty hours a week before the second accident and are then temporarily unable to work at all. It must then be examined how your capacity for work would probably have developed without the second incident. Perhaps a further build-up had been planned. Perhaps there was already uncertainty. That expectation must be substantiated and not presented afterwards as a certainty.

Sometimes consequences can be separated easily, for example an existing wrist limitation and a new ankle fracture. With similar neck, back or headache symptoms, that can be harder. Difficulty is a reason for better investigation, not for an arbitrary division without medical and legal explanation.

The timeline and the division of damage at a glance

This is the table that comes up in virtually every discussion with two insurers. Fill in for each row what has been established, and keep the file number for each event alongside it.

Period	Symptoms	Work	Housework and sport	Treatment	Source / file
Before accident 1	None / which?	Full-time, position	Independent	None	GP records, employer’s statement
After accident 1, before accident 2	Which symptoms, what intensity	Resumed / partly / not	What you could still do	Physiotherapy, specialist	File of insurer A, medical records
Immediately before accident 2	The situation at that moment: this is the key	Number of hours at that moment	What you did yourself	Ongoing treatment	Most recent documents before the date
After accident 2	Which symptoms are new or worse	Reduction in hours	Which tasks you could no longer do	New treatment	File of insurer B

The row “immediately before accident 2” often determines the outcome: it describes the starting position on which the second party who caused the damage must accept liability.

On that basis, the damage is divided. Which model fits depends on what can be established medically and factually:

Situation	Division	Whom do you hold liable?	Note
The consequences can be separated	Each bears their own share	Each party who caused damage, for their own share	Requires a clear medical demarcation
The second accident aggravates existing symptoms	The second party bears the aggravation	Mainly insurer B, for the additional part	The starting position must be established
Both events cause the same damage that cannot be divided	Both parties are liable for the whole; between themselves they divide it proportionately	Both insurers, for the whole	You do not have to wait for that division between them
Uncertain which accident caused the damage; both could have done so	Alternative causation (Article 6:99 of the Dutch Civil Code (BW))	Both, unless they prove that the damage was not caused by their event	Not an automatic solution: the conditions must be met
Uncertain whether the damage results from the accident or from another cause	Proportional liability or loss of a chance	The party held liable, according to a percentage	Two different doctrines with their own conditions: do not confuse them

Fictitious table for structuring purposes. Which model applies follows from the medical assessment and the facts established, not from a choice made in advance.

A timeline that makes the discussion concrete

Make a chronological overview with the dates of both accidents and the periods in between. Include treatment, return to work, relapse, medication and changes in help at home. At key moments, add a reference to the relevant document. This keeps the timeline verifiable.

Keep symptoms and financial consequences apart. A temporary increase in pain does not always lead to the same additional loss of income. Conversely, a limited change can have major consequences in an occupation where precision or physical strain is essential. So always describe the step from symptom to limitation and then to damage.

Also mention other relevant events, such as illness or a change in duties. Leaving these out may later undermine the reliability of the file. Your legal representative can assess which information is legally relevant and how it can be shared proportionately.

What medical information can and cannot show

Medical records help with the diagnosis, the course of symptoms and the limitations. They do not always directly answer the legal question of which insurer must pay which amount. A treating practitioner focuses on care. An independent expert can, under appropriate conditions, investigate additional questions.

The expert must have relevant information from both periods. Assessing only the file after the second accident can give an incomplete picture. That does not mean that every medical event in your life must be shared without restriction. The selection must fit the questions asked and your privacy.

A report may leave uncertainties. Sometimes a doctor cannot attribute an exact percentage to each accident. In that case, ask for an explanation of what can be established, which scenarios are medically plausible and which information is missing. Legal conclusions must then be drawn separately.

Questions for an independent expert

A useful set of questions examines the nature of the symptoms and limitations before and after both events. The expected course without the second accident may also be relevant. The questions must leave room for uncertainty and for several medically defensible scenarios.

Avoid leading questions that already assume all symptoms stem from one incident. Nor does it help to ask for a percentage without substantiation. An expert must be able to explain what the opinion is based on and where the limits of the investigation lie.

Discuss in advance who chooses the expert, which documents are provided and how the parties can respond to a draft report. If both insurers are involved in the same instruction, this can limit repeated examinations. Joint participation, however, is no guarantee that agreement will then be reached on all legal or financial points.

When several parties may be answerable for the same damage

There are situations in which several events for which someone is liable have contributed to the same damage. The law has rules on concurrent liability and on contribution between the liable parties. Whether those rules apply depends on the established contribution, the nature of the damage and the legal grounds.

A victim does not always have to resolve a complicated division dispute entirely on their own before any compensation is possible. But it does not follow as a general rule that every insurer involved must simply pay the entire claim. It must first be determined which liability actually exists.

So ask your legal representative to distinguish between your claim against the parties involved and the settlement between them. This prevents a dispute between insurers from wrongly being used as sufficient reason to leave a clearly substantiated, accepted part of your damage unpaid.

Alternative causation is not an automatic solution

In short, alternative causation concerns uncertainty as to which of several events caused the damage, while specific statutory conditions must be met. That route does not automatically fit every sequence of two accidents with similar symptoms.

Among other things, the possibility that each of the relevant events caused the damage and the liability for those events deserve attention. If, for example, the first incident was an accident of your own for which no one else can be held liable, the same reasoning cannot simply be applied as with two liable parties.

So first have it established exactly what uncertainty exists. Is it unknown which accident caused a particular injury? Or is it established that both had consequences, and is only the extent difficult to separate? These are different problems, to which the same legal solution does not necessarily apply.

Distinguishing proportional liability from loss of a chance

Proportional liability is not applied because a fifty per cent division seems practical. It is an exceptional approach with conditions and restraint. The nature of the uncertainty and the standard involved play a role. A medically unclear file is not sufficient in itself.

Loss of a chance concerns a different kind of assessment: the value of a lost chance of a more favourable outcome. That is not the same as uncertainty about which accident caused existing symptoms. The concepts must therefore not be used as interchangeable labels simply to arrive at an amount.

Contributory negligence is also a separate subject. It concerns circumstances that can be attributed to the injured party and that affect the division of damage. Existing symptoms are not simply contributory negligence. Careful advice always states which rule is being applied and why it fits your situation.

Advance payments while the division is being investigated

If liability and part of the damage are sufficiently clear, an advance payment can be discussed. Show which costs have been established by now, which payments have already been received and which part is still in dispute. That is stronger than simply pointing to the total duration of the case.

Ask for written agreements on how a payment is to be allocated and processed. An advance payment should later be correctly set off, without any uncertainty arising as to which accident or head of damage it related to. So keep payment statements alongside your combined overview of damage.

If insurers keep referring to each other, your legal representative can explore a targeted next step. That may be consultation, a joint expert examination or an appropriate procedure. Which route makes sense depends on the specific dispute and the documents available. Not every disagreement lends itself to the same procedure.

What if the first case has already been settled

An earlier settlement agreement may have consequences for the further assessment. Read which damage was settled, whether a full and final discharge was granted and whether there is a reservation. The wording and context of the agreement matter more than just the date of payment.

A closed first claim does not automatically prevent a claim for damage caused by a new accident. It must, however, be prevented that damage already compensated is claimed again. Assumptions from the first settlement may also be relevant, for example about future employment prospects or treatment.

So send the agreement to your legal representative in good time. Do not try to solve complicated questions about reopening or interpretation yourself by keeping the earlier compensation out of the file. Transparency makes it possible to define new damage carefully and to avoid contradictory positions.

Fictitious example of aggravation

After a first collision, an administrative employee still has neck symptoms, but is now working four days a week. The occupational health physician describes a planned further build-up. After a second collision, the symptoms increase and the employee is again completely unable to work.

For the second claim, it is not only the absence from work after that day that is considered. The earlier build-up, remaining limitations and expected development are also examined. As a result, the financial comparison may turn out differently than if the employee had already been permanently and fully unfit for work before the second accident.

This is a fictitious example without any prediction of liability or amount. It shows why up-to-date information from the intervening period is important. A single diagnosis before and after the accident says less than a coherent picture of functioning, treatment and work.

Evidence and records for two files

Keep a separate folder for each accident with the liability documents and correspondence. In addition, make one combined overview of symptoms, damage and payments. This prevents the two files from containing different versions of the same facts or advance payments from being processed twice.

Collect medical reports, information from the occupational health physician, payslips, work schedules and details of help at home. For each cost item, note which period it relates to and whether its attribution is still uncertain. You do not have to resolve that uncertainty yourself, but you do have to make it visible.

Also check the time limits for both claims separately. Negotiations in one file do not automatically protect the claim in the other. Note the legal entities, insurers, file numbers and the most recent formal steps involved. A case that is strong on the merits can still run into problems if time limits are missed.

Aligning correspondence between two files

Check whether both insurers are using the same factual timeline. Differences can arise because a medical letter was added later or a date of return to work was copied incorrectly. Correct such errors in a targeted way and keep the confirmation. This prevents substantive discussions from building on different starting points.

Present uncertainties in the same way in both files. If it is not yet known which part of the incapacity can be attributed to the second accident, that uncertainty should not be presented as a certainty in one of the files. Your legal representative can align the legal positions without unnecessarily limiting your claims.

Also keep track of paid costs centrally. An invoice can be shown to both parties for the investigation, but may not be collected twice as unpaid damage of your own. Record advance payments received and the agreements made on setting them off. This prevents corrections afterwards and supports a reliable combined assessment of damages.

Finally, make clear who coordinates contact. Two different claims handlers may request information separately, so that you have to tell the same story over and over again. An agreed consultation structure, a shared list of relevant documents and clearly defined open questions can make the handling more manageable. Your legal rights against each party still require separate attention.

The statutory rules on concurrent causes

With two accidents, provisions come into play that rarely play a role elsewhere:

Article 6:98 of the Dutch Civil Code attribution per event: which damage can be attributed to which accident, having regard also to the nature of the liability and of the damage.
Article 6:99 of the Dutch Civil Code (alternative causation) if the damage may have resulted from two or more events for which different persons are liable, and it is established that it arose from at least one of them, each of them is liable, unless he proves that the damage was not caused by his event. This is not a general fallback solution: the conditions are strict.
Article 6:102 of the Dutch Civil Code (joint and several liability) if several persons are obliged to compensate the same damage, they are jointly and severally liable. You can then claim the entire damage from one of them; they subsequently divide it between themselves.
Article 6:101 of the Dutch Civil Code contributory negligence, for example where the first accident was your own fault; this may affect the division.
Proportional liability and loss of a chance doctrines developed by the Supreme Court (Hoge Raad) for uncertainty about the cause. Proportional liability derives from HR 31 March 2006, ECLI:NL:HR:2006:AU6092 (Nefalit/Karamus); in HR 21 December 2012, ECLI:NL:HR:2012:BX7491 the Supreme Court explained the difference with loss of a chance and emphasised that proportional liability must be applied with restraint. Neither is interchangeable with Article 6:99 of the Dutch Civil Code.
Article 202 of the Dutch Code of Civil Procedure (Rv) if there is a persistent disagreement about the medical connection, a provisional expert report can be requested, preferably with one joint set of questions for both files.

The articles have been checked on wetten.overheid.nl. As a victim, you do not have to resolve the division between the parties yourself first, but it does not follow that every insurer involved will simply pay the whole.

Frequently asked questions about two accidents

Do I have to inform both insurers?

Relevant information about both accidents must be shared carefully. Discuss with your legal representative which documents are needed and through which route medical data will be provided. Concealing an earlier accident can make the assessment more difficult.

Will my damage automatically be split in two?

No. An equal division does not follow from the number of accidents. Liability, contribution to the damage and the applicable legal rules must be examined. A percentage requires substantiation.

Can I claim if I already had symptoms?

Yes, existing symptoms do not rule out new damage. It must, however, be examined which additional consequences arose from the subsequent accident. How you were functioning immediately before the new incident is important here.

What if the first accident was my own fault?

In that case, liability for the second accident must be assessed independently. Importantly, contributory negligence in the first accident does not automatically carry over into your claim against the party who caused the second. Contributory negligence within the meaning of Article 6:101 of the Dutch Civil Code concerns circumstances attributable to you that contributed to the damage for which you are holding that specific party liable. The fact that you previously caused an accident yourself is not sufficient in itself. What can play a role is the condition you were in: the second party is not responsible for damage that already existed, but is responsible for aggravation or disruption of your recovery.

Can I get an advance payment during the dispute?

That can be explored if liability and part of the damage are sufficiently clear. Record the costs already incurred and payments received in a clear overview. There is no automatic entitlement to every amount requested.

Do I have to show my old settlement agreement?

It may be important for distinguishing between damage already compensated and new damage. Give it to your legal representative, including any reservations and calculations. Its significance must be assessed on the basis of the specific arrangements made.

Can I hold both insurers liable at the same time?

Yes, and that is often sensible. Hold both parties liable in good time, if only to prevent the claim from becoming time-barred. If it later turns out that there is joint and several liability, you can claim the entire damage from one of them. Do keep two separate files, noting for each document the date and the accident it relates to.

What if the first accident has already been settled with a full and final discharge?

In that case, that claim is in principle closed, but you can still claim the consequences of the second accident. The earlier settlement agreement then becomes important evidence: what was paid for at the time, what end state was assumed and what reservations were made. Put that document on the table before the discussion about aggravation begins.

Is one joint expert examination sufficient for both files?

That is usually the best route: one expert who assesses the whole timeline, with questions that address both events. This avoids two reports that contradict each other. All parties involved must, however, agree on the expert, the questions and the division of costs.

Bringing coherence to your personal injury cases

With two accidents, a coherent approach helps prevent medical uncertainty and insurance disputes from becoming entangled. Start with a reliable timeline, separate liability files and one verifiable record of damage.

Arslan Advocaten can assess your personal injury claim and examine which next step fits the dispute. You can submit both accidents via the contact page. Also bring documents about the intervening period and any earlier settlement.