An accident can make an existing health problem worse or cause new symptoms in an area that was already affected by an injury or medical condition. If this happens to you, you may wonder whether your medical history could prevent you from seeking compensation. In Ontario, a pre-existing condition’s effects on a personal injury claim depend on several factors, including how the accident affected you, what your condition was like beforehand, and the evidence connecting your injuries to the incident.
Having a pre-existing condition does not automatically disqualify you from making a claim. The key question is how the accident contributed to your current symptoms, limitations, and losses.
Can You Make a Personal Injury Claim With a Pre-Existing Condition?
Yes, you may still have a personal injury claim if you had a medical condition before an accident. A previous diagnosis, old injury, or history of chronic pain does not automatically mean you cannot seek compensation for additional harm caused by someone else’s negligence.
For example, imagine you have managed occasional back pain for years. After a motor vehicle collision, your pain becomes more severe, you need additional treatment, and you can no longer perform certain duties at work. If the collision caused or contributed to that deterioration, you may be able to claim compensation for the resulting losses.
The outcome depends on the circumstances and supporting evidence. A claim generally needs to establish that another party was legally responsible for the accident and that the accident caused or contributed to the injuries and losses for which compensation is sought.
It is also necessary to distinguish between symptoms that existed before the incident and changes that followed it. Medical records, treatment history, and evidence about your daily activities before and after the accident can help clarify that difference.
How the Thin Skull Rule May Protect Your Claim
Canadian personal injury law recognizes that people have different medical histories and levels of physical or psychological vulnerability. The thin skull rule addresses situations where a person suffers more serious harm than might ordinarily be expected because of a pre-existing condition.
Under this principle, a person responsible for an injury generally cannot avoid liability simply because the injured person was more vulnerable than someone else. If their negligence caused an injury, they may be responsible for the full extent of the harm caused, even if an existing condition made the outcome more severe.
Consider someone with a previous neck injury that had become stable. If a collision aggravates that injury and leads to substantially greater pain or reduced mobility, the person’s medical history does not automatically prevent them from seeking compensation for the additional harm.
The rule does not mean every symptom after an accident is automatically attributable to the incident. The injured person must still establish the necessary connection between the defendant’s conduct and the harm claimed. Medical evidence and the facts of the case can be important in determining that connection.
What If Your Condition Was Already Getting Worse?
A related legal concept, known as the crumbling skull rule, may apply when a pre-existing condition was already deteriorating or carried a measurable risk of causing future problems, even without the accident.
In these circumstances, a defendant may not be responsible for losses that would have occurred anyway. However, they may still be responsible for the additional harm caused by the accident or for the acceleration of a condition’s progression.
For example, imagine someone has a degenerative spinal condition that was gradually limiting their mobility. A fall caused by another party’s negligence then accelerates that decline, leading to earlier treatment or greater limitations than would otherwise have been expected.
The legal assessment would consider what likely would have happened without the fall and how the incident changed that course. The fact that the condition was already progressing does not automatically eliminate a claim, but it may affect how damages are assessed.
The distinction between these two rules is fact-specific. Medical history, prognosis, and expert opinions may help establish whether the accident caused new harm, aggravated a stable condition, or accelerated a problem that was already developing.
What Evidence Can Help Support Your Claim?
When a pre-existing condition is involved, evidence can help explain your health before the accident, the changes that followed, and the impact on your life. You do not need to have been in perfect health before the incident to pursue a claim, but it is important to provide an accurate account of your medical history.
Medical records and treatment history: Records from before and after the accident may help show what symptoms you experienced previously, what treatment you received, and whether your condition changed after the incident. Your healthcare providers may also be able to explain how the accident affected your health.
A clear account of new or worsening symptoms: Describe what changed after the accident. Increased pain, reduced mobility, new symptoms, or a greater need for assistance may be relevant. Be specific about when changes began and how they affect your routine.
Employment and daily activity records: If your condition affects your ability to work, care for your family, exercise, or complete household tasks, records and personal accounts may help demonstrate the impact. Depending on your claim, evidence of lost income or additional expenses may also be relevant.
Expert medical opinions: In some cases, medical experts may be asked to assess the relationship between the accident and your current condition. Their opinions can help distinguish the effects of the incident from symptoms or limitations that existed beforehand.
You should be honest about previous diagnoses, symptoms, and treatment. Leaving out relevant medical information can create problems later, while a complete record gives your legal team a better opportunity to assess the claim accurately.
How Can a Pre-Existing Condition Affect Compensation?
A pre-existing condition may affect the value of a personal injury claim, but the effect depends on the evidence and the nature of the losses.
If an accident significantly worsens a previously stable condition, compensation may account for the additional pain, treatment needs, income loss, and other eligible losses caused by the incident. If a condition would likely have caused some of those losses regardless of the accident, that possibility may also be considered.
The assessment is not simply a matter of subtracting every symptom or limitation that existed before the accident. It involves determining the difference between the person’s actual situation after the incident and the position they likely would have been in without the defendant’s negligence.
Compensation also depends on other factors, including the type and severity of the injuries, recovery outlook, impact on employment and daily activities, and the legal requirements that apply to the claim. No particular outcome can be guaranteed based on a diagnosis alone.
Because these assessments can involve complex medical and legal questions, getting advice about your circumstances can help you understand what evidence may be needed and which losses may be relevant.
What Should You Do After an Accident?
If an accident has worsened an existing condition, seek appropriate medical care and explain your symptoms and medical history to your healthcare provider. Follow the recommended treatment plan and keep records of appointments, expenses, and changes in your daily activities.
It can also help to keep a simple record of how your symptoms affect your routine, including work responsibilities, mobility, sleep, and activities you previously managed without difficulty. Avoid assuming that your claim is invalid because you had a diagnosis before the accident.
A personal injury lawyer can review the circumstances, explain how the law may apply, and help identify the evidence needed to assess your claim. Legal advice is particularly useful when it is difficult to distinguish the effects of the accident from the progression of an existing condition.
Nesbitt Coulter LLP provides information about personal injury matters and other legal issues. If you have questions about how your medical history could affect a potential claim, contact Nesbitt Coulter LLP to discuss your circumstances.
FAQs
Can I file a personal injury claim if I had an injury before the accident?
Yes, you may still be able to make a claim. The key issue is whether the accident caused or contributed to additional harm and whether the legal requirements for liability and compensation can be established.
Do I need medical records from before the accident?
Pre-accident records can be helpful because they may establish your previous symptoms, treatment, and level of function. If those records are unavailable, other evidence may still help explain your medical history and how your condition changed.
Can a pre-existing condition reduce my compensation?
It may affect the assessment of damages if some of the losses would likely have occurred even without the accident. However, a pre-existing condition does not automatically eliminate your right to seek compensation for harm caused by another party’s negligence.