What Evidence Can Make or Break an Ontario Personal Injury Claim?

October 12, 2026, Kitchener, Ontario

Posted by: Robert Deutschmann, Personal Injury Lawyer

When you're injured because of someone else's negligence, your first priority is understandably getting better.

But if you later pursue a personal injury claim, another question becomes important:

How do you prove what happened and demonstrate how the injury has affected your life?

The answer often comes down to evidence.

Start with the accident scene

If you're physically able to do so safely, photographs can be extremely valuable.

Depending on the circumstances, consider documenting:

• The accident scene
• Road, weather or property conditions
• Vehicle damage
• Hazards that may have contributed to the incident
• Warning signs
• Visible injuries
• Damage to clothing or personal property

Take both photographs of the specific hazard and wider photographs showing the surrounding area.

Conditions can change quickly. Snow and ice disappear, vehicles are repaired and hazards may be removed.

A photograph can preserve a record of what the scene looked like at the time of the accident.

Medical records are critical

Medical documentation can help establish the nature of an injury, when symptoms began and how they progressed.

Be as specific as possible when describing your symptoms to your healthcare providers.

Don't simply say that your back hurts.

Explain how the injury affects your ability to:

• Work
• Sleep
• Exercise
• Drive
• Care for your family
• Perform household responsibilities
• Participate in activities you previously enjoyed

The impact of an injury extends beyond a diagnosis.

Keep records of your expenses

Injuries can create unexpected costs.

Keep receipts and other documentation for accident-related expenses such as medication, treatment, transportation, parking, equipment and other necessary services.

Small expenses can add up over time.

Employment records can also be important

If your injury affects your ability to work, document what has changed.

This may include:

• Missed work
• Reduced hours
• Modified duties
• Lost income
• Changes in your ability to perform your job

Your employer's records may ultimately help establish the financial consequences of your injury.

Witnesses and video can provide valuable evidence

If someone witnessed the accident, obtain their contact information if possible.

Surveillance footage, dashcam recordings, traffic-camera footage and other video may also help establish what occurred.

This evidence can be particularly important when there are conflicting accounts of an accident.

Be thoughtful about social media

Social media can become part of the evidence in a personal injury claim.

A photograph or post does not necessarily tell the complete story of someone's physical or psychological condition. However, posts may be reviewed by insurers or opposing counsel and potentially used to challenge the severity or consistency of an injury claim.

Think carefully before posting about your accident, recovery, activities or physical abilities.

Evidence tells the story of an injury

A personal injury claim isn't based solely on the fact that an accident occurred.

The evidence needs to help establish:

• What happened.
• Who was responsible.
• What injuries resulted.
• How those injuries have affected your life.
• What losses and future needs may result.

That is why preserving evidence early can be so important.

If you or someone you care about has suffered a serious injury, obtaining legal advice can help you understand what evidence may be relevant to your particular circumstances and what steps should be taken to protect your rights.

Deutschmann de Koning Law represents injured people throughout Kitchener-Waterloo, Cambridge, Guelph, Woodstock and Southwestern Ontario.

This article provides general information about Ontario personal injury law and is not legal advice. The evidence required and legal issues involved will depend on the circumstances of each case.

About Deutschmann de Koning Law

Deutschmann de Koning Law serves South-Western Ontario with offices in Kitchener-Waterloo, Cambridge, Woodstock, Brantford, Stratford and Ayr. The law practice of Robert Deutschmann and Nick de Koning focuses almost exclusively in personal injury and disability insurance matters. For more information, please visit www.ddinjurylaw.com or call us at 1-519-742-7774.