Written By: Dale Orlando, Principal Partner, and Alicia Abbott, Summer Student
9 Minute Read
The impacts of brain injury often times cannot readily be seen on the surface. In many cases of mild or moderate brain injury, symptoms develop gradually, causing individuals to not recognize that they have sustained a brain injury until weeks or months after the initial incident. This issue is further compounded by limitations in medical imaging technology and the brief nature of doctor appointments, both of which make it challenging to fully identify and document the true severity of the injury.
In mild to moderate brain injury cases, evidence from lay witnesses plays a critical role in establishing the validity of the claim. Lawyers rely on accounts from family members, friends, co-workers, and others in the injured person’s life to help bridge the gap between medical records and lived experience. This evidence helps build a more accurate picture of how the injury has affected the individual’s day-to-day functioning. This blog explores the role of witness evidence in brain injury claims, what forms it can take, and how it can be influential at every stage of the litigation process.
Why Brain Injuries Can Be Difficult to Measure
Brain injuries are frequently described as an “invisible injury.” [1] Unlike fractures to bones, neurological damage often occurs at a microscopic level and is not visualized by current imaging technology. It is common for a CT scan or MRI to appear “normal” even after a moderately severe traumatic brain injury. Standard emergency room scans, like CTs, are effective at finding life-threatening intracranial bleeding, but they often miss microscopic damage. [2]
The delayed onset of symptoms adds another challenge to measuring brain injuries. Victims of multi-trauma often arrive at the emergency department with obvious and life threatening orthopedic or internal injuries. Mild to moderate brain injuries often go overlooked as they are difficult to diagnose and do not present the same level of immediate threat as other forms of traumatic injury. The brain is effective at compensating for damage, using healthy regions to route around injured areas so you can continue functioning. [3] It is not until these pathways are eventually overwhelmed where symptoms may present themselves. This delay looks different for adults and children. In adults the passage of time makes it easy to misattribute symptoms to “life stress” or other conditions rather than a past injury. For children, since their brains are still developing, the true extent of an injury may stay hidden until they face increasing cognitive demands such as entering school or work.
Why Evidence From Family, Friends, and Co-Workers Matters
Given the challenges of measuring brain injuries, evidence from interpersonal relationships can be vital in a legal claim. In order to be successful, lawyers must demonstrate not only that a brain injury was sustained, but also how that injury has changed the injured person’s life. This involves painting a picture of who you were before the accident compared to who you are today. Family members, friends, teachers, employers, and caregivers are uniquely positioned to provide this perspective because they are able to observe the individual over time and provide an unbiased before and after picture of the person’s functional capacities.
Types of Witnesses Commonly Involved in Brain Injury Claims
Family Members
- Family members observe changes in your day-to-day functioning that may only manifest in the privacy of your home.
- They may be the first to observe subtle changes such as mood swings, sleep disturbances, and altered family dynamics.
Friends
- Friends can provide evidence about any loss of enjoyment of life.
- They may speak to any withdrawal from hobbies, sports, and social activities the injured person once enjoyed.
Teachers and Professors
- Since pediatric brain injuries can stay hidden until a child encounters increasing cognitive demands, teachers provide the long-term observation needed to identify these delayed symptoms.
- They may speak to changes in behaviour or emotional regulation in the classroom in addition to any changes in academic performance.
Employers and Co-workers
- Employers and co-workers can contribute by observing changes in workplace functioning.
- They may speak to reduced reliability, productivity, attendance, or any difficulties with multitasking that was not an issue before the injury.
Caregivers and Support Workers
- Caregivers and support workers are equipped to speak to the injured person’s recovery after the injury.
- This can include the level of assistance required for personal care and everyday activities.
- They may also speak to ongoing challenges throughout rehabilitation.
How This Evidence Supports Medical Records
Medical records form the foundation of every brain injury claim because it provides evidence of the injury’s existence. It often includes documentation of diagnosis, treatment, and the progression of the condition over time. [4] However, medical records do not always capture the true extent of an injury. Lay witness observations bridge the gap between medical findings, and the reality of how an injury impacts day-to-day life.
How Family and Witness Evidence Is Used in a Claim
Witness evidence plays a significant role throughout a brain injury claim, from the early stages of gathering evidence to settlement negotiations and, if necessary, trial.
Medical assessments
- Medical experts may review witness statements to better understand how symptoms affect the person’s life outside of a clinical setting.
Mediation and settlement discussions
- Witnesses do not usually testify at mediation, but their statements form part of the evidence relied upon.
- During negotiations, witness evidence may help to refute arguments that an injury is minor or is unrelated to the accident.
Trial Testimony
- At trial, witnesses may be called to testify about what they observed before and after the accident.
- This evidence can help the court understand intangible experiences, while also reinforcing medical evidence.
Common Misconceptions About Witness Evidence
Many people believe that without extensive medical evidence, a brain injury cannot be proven in legal claims. However, since medical experts often only see a patient for a brief period of time, courts tend to find the testimony of people who knew you before and after the accident to be persuasive.
Another misconception is that witness evidence is only important at trial. Rather it can be influential much earlier in the process. Statements are often used during the assessment of the claim, in medical evaluations, and in settlement discussions to help demonstrate the true impact of the injury.
How a Lawyer Can Help Gather and Present This Evidence
Building a strong brain injury claim requires much more than obtaining medical records. It is developed through a careful process of identifying, coordinating, gathering, and presenting evidence from the people who have seen the changes in the injured person’s life firsthand. Lawyers play a central role in this process. They work closely with potential witnesses to piece together a complete picture of how the brain injury has affected the individual’s day-to-day functioning..
This blog, outlines the characteristics to look for when finding the right personal injury lawyer.
Conclusion
If you believe you have sustained a brain injury, it is important to carefully document any changes you experience, even if they seem minor or unrelated at first. Keeping a journal of symptoms can help create a record that may later support your claim. It is also helpful to consider the people in your life who have observed these changes firsthand who can provide evidence about how your functioning has shifted since the injury.
If you are considering pursuing a brain injury claim, seeking legal guidance early can help ensure that the right evidence is preserved, and that your lived experience is properly reflected in your claim. Our lawyers can help make an often-invisible injury visible, ensuring your losses are fully understood and you are able to focus on your recovery.
For more information about brain injuries, please see the following resources:
Ontario Brain Injury Association – Resources
Brain Injury Canada – Resources
SOURCES:
[1] Brain Injury Association, “Brain Injury as a Form of Invisible Disability” (n.d.) online (website): https://biausa.org/public-affairs/media/brain-injury-as-a-form-of-invisible-disability.
[2] National Library of Medicine, “Traumatic Neuroemergency: Imaging Patients with Traumatic Brain Injury—An Introduction” (15 February 2020) online (website): https://www.ncbi.nlm.nih.gov/books/NBK554351/#:~:text=CT%20examination%20is,non%2Dhemorrhagic%20lesions
[3] Dr Alina Fong, “37 Symptoms of Old Head Injury and How to Treat Them” (10 March 2026) online (website): https://www.cognitivefxusa.com/blog/symptoms-of-old-head-injury.
[4] Lafferty Scott, “The Role of Medical Records in Brain Injury Cases” (4 February 2026) online (website) https://www.lgslaw.net/the-role-of-medical-records-in-brain-injury-cases/.
