“It Hurts More After Every Shift!” | Hurt Over Time, Not in One Moment? How WSIB Handles Repetitive Strain

Not every work injury comes with a fall or a bang. Sometimes it is a wrist that aches a little more each shift, a shoulder that finally gives out, or a back that never quite recovers over the weekend. If that sounds familiar, you may still have a WSIB claim.

Can I claim WSIB for an injury that built up over time?

Yes, it can be accepted. The WSIB's policy on the definition of an accident, policy 15-02-01, includes "a disablement arising out of and in the course of employment." The policy says disablement includes "a condition that emerges gradually over time" and "an unexpected result of working duties."

So repetitive strain, overuse injuries and conditions that developed from your everyday duties can all fall inside the definition. The question the WSIB has to answer is whether the condition arose out of and in the course of your work.

What date counts as my date of injury?

This is where gradual injuries differ. The WSIB's policy on determining the date of injury, policy 11-01-04, says that for gradual onset claims the date of injury is set using the date of first medical attention that led to the diagnosis, or the date of diagnosis, whichever is earlier. Its own example is a worker who gradually develops wrist and hand symptoms from work duties.

That date matters. Your date of injury affects your benefits and the timing of your claim. The WSIB asks for your claim within six months of the date of injury or the date of diagnosis, so do not wait for the pain to become unbearable. Write down the day you first saw a health professional about it.

What evidence helps a repetitive strain claim?

Detail. A gradual injury is about how you work, so the WSIB needs a clear picture of your duties. The more specific, the better.

• What you do, exactly. The movements, the tools, the weights, the positions.
• How often and how long. Repetitions per hour, hours per shift, years in the role.
• What changed. A new machine, a faster line, longer shifts, fewer people on the team.
• When symptoms started. And how they have changed since.
• A medical opinion. One that connects your condition to your duties.
• Co-workers. People who do the same tasks and can describe them.

A written job description often leaves out what the job really asks of your body. Your own account fills that gap.

What if I had problems in that area before?

A pre-existing condition does not automatically end a claim. Our article “They Say It Was Already There!” | WSIB Blamed a Pre-Existing Condition? What the Rules Actually Say explains how the WSIB weighs it and what medical evidence helps.

What if my employer says it is not work-related?

Your employer can share its view, but the WSIB decides. Our article “My Boss Doesn't Believe Me!” | Your Employer Says Your Injury Isn't Work-Related? Here Is What Happens Next explains what happens next.

What should I record now?

• A daily symptom note. Pain rated each day, and what made it worse.
• Your tasks and hours. What you did on each shift, and for how long.
• The first time you told a supervisor. The date, who it was and what they said.
• Every appointment. Who you saw and what you were told.
• What you have stopped doing. At home and at work, and when it started.

Who can help?

The Office of the Worker Adviser, if you are not in a union. It is an independent agency of the Ontario government, and its service to non-unionized injured workers is free. Its number for English service is 1-800-435-8980. If you are in a union, start with your union representative. A community legal clinic is another free route.

Read next

• “I'm Staring at a Blank Form!” | How to Fill Out WSIB Form 6 So Your Claim Starts Strong
• “I Paid for My Prescription Myself!” | What Does WSIB Pay For? Prescriptions, Physio and Travel, Explained
• “WSIB Rejected My Claim!” | WSIB Denied Your Claim? Your Next Steps Before the Deadline

If your recovery were reviewed tomorrow, what would your record say?

The National Workplace Injury Recovery Guide is where your recovery gets documented, day by day. Symptoms, appointments, calls and costs, written while they are fresh. It works in every province and it stands on its own.

See the National Guide$39

Both guides, $39 until 22 November. Add the Ontario Workplace Injury Companion Guide for the dates and rules that shape your recovery in Ontario, and the discount applies at checkout. Bought separately: $63.99.

Every figure in this article comes from a named source. How we check
Last verified: October 2026.