Case Law

Mustapha v. Culligan and Saadati v. Moorhead: Claims for Mental Injury

Negligence law compensates more than physical injuries. Two Supreme Court of Canada decisions set the rules for mental injury claims: Mustapha v. Culligan of Canada Ltd., 2008 SCC 27, and Saadati v. Moorhead, 2017 SCC 28.

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The short answer
  • The mental injury must be serious and prolonged, beyond ordinary annoyance, anxiety and fear.
  • It must be a reasonably foreseeable result of the defendant's negligence for a person of ordinary fortitude.
  • A recognized psychiatric diagnosis is not required (Saadati).
  • Expert evidence can help prove the injury, but isn't legally required.

Mustapha v. Culligan (2008)

While replacing a bottle of drinking water at home, Mr. Mustapha saw a dead fly and part of another in it. He developed a serious psychological illness. The Supreme Court held that his injury was real, but that it was not reasonably foreseeable that a person of ordinary fortitude would suffer serious injury from seeing flies in water. His claim failed because the harm was too remote.

Saadati v. Moorhead (2017)

Studying at a desk in a library

Mr. Saadati was in a car crash. Friends and family testified that his personality changed afterwards, but there was no expert diagnosis of a psychiatric illness. The Supreme Court held that a plaintiff doesn't need to prove a recognized psychiatric illness to recover for mental injury. What matters is whether the injury is serious and prolonged and rises above ordinary emotional upset.

Building a claim

  • Describe how the incident changed your daily life, work, relationships and sleep.
  • Gather evidence from people who know you, and any medical or counselling records.
  • Show that someone of ordinary resilience could foreseeably be harmed in the same way.
  • For car accidents in Ontario, special rules apply to claims for pain and suffering, including a threshold and a deductible, so get advice.

Photos from Pexels: The scales of justice beside a laptop · Studying at a desk in a library.

This article is general information for people in Ontario, not legal advice. Rules, forms and deadlines change, and every situation is different. Check the current rule or speak to a licensed legal professional before you act.

Not sure where you stand? A licensed paralegal can look at your documents and tell you your options.

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Law Society of Ontario — Barreau de l'Ontario
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