The First 72 Hours After a Car Accident in Ontario: 12 Mistakes That Could Hurt Your Recovery and Your Claim

August 17, 2026, Kitchener, Ontario

Posted by: Robert Deutschmann, Personal Injury Lawyer

A car accident can happen in seconds.

Whether it's a rear-end collision on Highway 401, a T-bone crash at a Cambridge intersection, or a parking lot accident at your local grocery store, the moments immediately following a collision are often filled with confusion, stress, and adrenaline.

Many people walk away believing they're "fine" only to wake up the next morning with neck pain, headaches, dizziness, or stiffness that wasn't obvious immediately after the crash.

The first 72 hours following a collision are among the most important for your physical recovery and, if you've been injured, for protecting your legal rights.

At Deutschmann de Koning Personal Injury Law, we've worked with injured Ontarians for decades. While every collision is unique, we've seen the same preventable mistakes occur time and time again.

Here are twelve of the most common mistakes and how to avoid them.

In the News

Police across Waterloo Region respond to hundreds of motor vehicle collisions each year. While some involve only property damage, many result in injuries that aren't immediately apparent.

Medical professionals often remind patients that the effects of adrenaline can temporarily mask pain, meaning symptoms may not develop until hours—or even days—after a collision.

That's why what you do after leaving the scene is just as important as what happens at the scene itself.

1. Assuming You're Not Injured

One of the biggest mistakes people make is saying:
"I'm okay."

Immediately after a collision, adrenaline can hide symptoms.

Common injuries that may appear later include:

• Whiplash
• Concussions
• Soft tissue injuries
• Shoulder injuries
• Back injuries
• Knee injuries

Never assume you're uninjured simply because you feel okay immediately after the crash.

2. Delaying Medical Attention

Even if your injuries seem minor, seek medical evaluation as soon as possible.

Medical records created shortly after the collision help:

• Diagnose injuries early.
• Begin treatment sooner.
• Document symptoms.
• Create an important timeline for insurance purposes.

Waiting several days can make recovery more difficult and may complicate insurance claims.

3. Forgetting to Photograph the Scene

If it is safe to do so, document:

• Vehicle positions
• Damage
• Road conditions
• Traffic signs
• Traffic signals
• Weather
• Skid marks
• Debris
• Visible injuries

These details may disappear within hours.

4. Ignoring Your Symptoms

Many people try to "tough it out."

Instead:

• Monitor headaches.
• Watch for dizziness.
• Note neck stiffness.
• Record sleep problems.
• Pay attention to emotional changes.

These symptoms can indicate more significant injuries.

5. Not Reporting the Collision Properly

Depending on the circumstances, Ontario law may require you to report the collision.

You should also notify your insurance company promptly.

Delays can create unnecessary complications later.

6. Throwing Away Evidence

Don't discard:

• Torn clothing
• Damaged helmets
• Broken child seats
• Eyeglasses
• Footwear

These items may become important evidence.

7. Posting About the Accident on Social Media

Many people immediately post:

"I'm okay!"

or

photos from the collision.

Avoid discussing:

• Injuries
• Fault
• Insurance
• Recovery

Insurance companies may review publicly available social media.

8. Forgetting Witness Information

Independent witnesses can become invaluable later.

If possible, obtain:

• Names
• Phone numbers
• Email addresses

People become much harder to locate weeks later.

9. Not Keeping Medical Receipts

Save records for:

• Prescriptions
• Parking
• Medical appointments
• Physiotherapy
• Massage therapy
• Medical devices

Organizing early can save considerable stress later.

10. Returning to Normal Activities Too Quickly

Many people return to work or sports before they've fully recovered.

Doing too much too soon may:

• Delay healing.
• Increase pain.
• Aggravate injuries.

Always follow medical advice regarding activity levels.

11. Failing to Keep a Recovery Journal

A simple notebook can become extremely valuable.

Record:

• Daily pain levels
• Medical appointments
• Missed work
• Sleep quality
• Activities you cannot perform
• Emotional effects

Recovery journals often provide a much clearer picture than memory alone.

12. Waiting Too Long to Understand Your Rights

You don't need to make legal decisions immediately.

However, obtaining information early can help you understand:

• Accident benefits
• Insurance deadlines
• Available medical benefits
• Documentation requirements

Early guidance often prevents problems later.

Local Perspective

Waterloo Region presents unique driving challenges.

Busy Highway 401 interchanges, modern roundabouts, growing cycling infrastructure, rural roads, and increasing traffic volumes all contribute to a wide variety of collision types.

Whether an accident occurs in Cambridge, Kitchener, Waterloo, Ayr, Elmira, Baden, or New Hamburg, the steps you take afterward remain remarkably similar.

Preparation—not panic—is your best ally.

Myth vs. Fact

Myth

"If I don't feel pain immediately, I'm not injured."

Fact

Many collision-related injuries develop gradually over several hours or days.

Myth

"I only need photos of the damaged vehicles."

Fact

Road conditions, traffic signs, weather, skid marks, and vehicle positions may all become important evidence.

Myth

"My insurance company will automatically gather everything."

Fact

Taking your own photographs and preserving your own records provides valuable protection.

Practical Checklist

Within the first 72 hours:

1. Seek medical care.
2. Report the collision.
3. Notify your insurer.
4. Photograph everything.
5. Save receipts.
6. Record symptoms.
7. Keep follow-up appointments.
8. Preserve evidence.
9. Start a recovery journal.

Frequently Asked Questions

Should I go to the hospital even if I feel okay?

If you have any concerns—or if symptoms develop shortly after the collision—medical assessment is always advisable.

Should I accept the first insurance offer?

Every situation is different. Before making important decisions, ensure you understand your injuries and your rights.

What if my symptoms appear two days later?

This is common. Seek medical attention promptly and advise your healthcare provider that the symptoms developed following the collision.

How long should I keep records?

Maintain copies of all medical records, receipts, correspondence, and notes relating to your recovery.

The Bottom Line

The hours immediately following a collision are often overwhelming, but the decisions you make during the first few days can have a lasting impact on both your recovery and your ability to navigate Ontario's insurance system. Prioritize your health, document everything, and don't hesitate to seek professional guidance if you have questions about your legal rights.

If you've been injured in a motor vehicle accident, the experienced team at Deutschmann de Koning Personal Injury Law is here to provide clear, compassionate guidance and help you understand your options every step of the way.

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.