The short version: acquired brain injury is the umbrella term for any damage to the brain that happens after birth, and traumatic brain injury is one type of it, caused by an outside force such as a blow to the head. So every traumatic brain injury is an acquired brain injury, but not every acquired brain injury is traumatic. Knowing which word a report uses helps you follow what happened and what comes next.
If you have been handed a discharge letter or sat through a meeting full of unfamiliar terms, you are not alone. This article explains the difference in plain English so you can read reports and care conversations with more confidence.
What is the difference between acquired and traumatic brain injury?
Acquired brain injury (often shortened to ABI) is the broad category. It covers any injury to the brain that occurs after birth and is not related to a genetic or congenital condition. Traumatic brain injury (TBI) is one cause within it, where the damage comes from an external physical force.
Put simply, acquired brain injury is the family name and traumatic brain injury is one member of the family. The two terms are not interchangeable, even though people sometimes use them as if they were. According to Headway, the brain injury association, acquired brain injury describes injury that has happened since birth and is not the result of inherited or birth conditions (Last verified 2026-06-09).
What counts as an acquired brain injury?
An acquired brain injury is any brain injury that happens after birth. It splits into two broad groups: traumatic causes (an outside force) and non-traumatic causes (something inside the body).
Non-traumatic acquired brain injuries can include:
- A stroke, where the blood supply to part of the brain is interrupted
- A brain haemorrhage or aneurysm
- A lack of oxygen to the brain, sometimes called a hypoxic or anoxic injury
- An infection such as meningitis or encephalitis
- A brain tumour, or the effects of treatment for one
These are grouped together because the brain has been injured during a person's life, rather than from a condition present from birth. The NHS guidance on recovery after a severe head injury describes rehabilitation as tailored to the person and the part of the brain affected (Last verified 2026-06-09).
What counts as a traumatic brain injury?
A traumatic brain injury is caused by a sudden external force to the head or body that disrupts how the brain works. The damage comes from the impact itself, rather than something internal like a clot or a lack of oxygen.
Common causes include falls, road traffic collisions, assaults, and sports injuries. The severity ranges widely, from a concussion that settles over days or weeks, to a serious injury with lasting effects on movement, thinking, mood, and communication. Two people described as having a traumatic brain injury can have very different experiences, depending on which areas of the brain were affected.
Why does the wording in a report matter?
The wording matters because it tells you, and the team supporting your family member, what kind of injury happened and where the focus of care sits. A report might use the umbrella term acquired brain injury, name a specific cause such as stroke, or use traumatic brain injury for an impact injury.
Knowing the distinction helps in a few practical ways:
- You can follow conversations without guessing what each term means
- You can ask clearer questions of the GP, consultant, or care team
- You can make sense of the support being suggested, because the cause often shapes the plan
If a report uses a term you do not recognise, it is reasonable to ask the clinician or care team to explain it in plain words.
How does the type of injury affect rehabilitation and support?
The type of injury is one factor among several, but it does not decide everything on its own. Whatever the cause, rehabilitation and reablement focus on the effects a person is living with day to day, such as fatigue, memory changes, or difficulty with routines, rather than the label alone.
At Axon Neuro we work with people affected by different types of brain injury, including stroke and traumatic brain injury, as well as other neurological conditions. We start with the person and what they want to be able to do, then build support around that. Progress is rarely a straight line, and the same diagnosis can look very different from one person to the next. Where a health decision is involved, we suggest speaking with a GP, consultant, or the wider care team.
If communication has changed since the injury, our note on communication changes after brain injury may help, and families navigating a stroke may want our piece on supporting a family member after a stroke.
Frequently asked questions
Is a stroke an acquired brain injury?
Yes. A stroke is a type of acquired brain injury caused by an interruption to the blood supply in the brain. It is non-traumatic, meaning it is not caused by an external force, so it sits in the acquired brain injury category but is not a traumatic brain injury.
Is every traumatic brain injury also an acquired brain injury?
Yes. Traumatic brain injury is one cause within the wider acquired brain injury group. Every traumatic brain injury is an acquired brain injury, but many acquired brain injuries, such as those from stroke or infection, are not traumatic.
Is concussion a traumatic brain injury?
Concussion is usually described as a mild traumatic brain injury, because it is caused by an external force to the head. Symptoms such as headache, tiredness, or difficulty concentrating can last for a time. If they persist or worsen, it is sensible to speak to a GP or seek medical advice.
Where can I find trustworthy information about brain injury?
Reliable starting points include the NHS and Headway, the brain injury association. For anything specific to your family member's situation, the GP, consultant, or care team who know the case are the right people to ask.
Talk it through with us
If you are trying to make sense of a brain injury in your family and what support might help, you are welcome to get in touch through our contact form. There is no pressure. We are happy to explain how reablement works and what could suit your situation.