What Are the Different Types of Brain Injuries?

Posted on May 22, 2026 written by Jane Paulson in Brain Injury

Key Takeaways

• Brain injuries fall into two main categories: traumatic injuries from external force and acquired injuries from internal medical events.
• Common traumatic brain injuries include concussions, contusions, diffuse axonal injuries, and penetrating injuries.
• Brain injuries can be closed or open, and that difference affects how quickly they are diagnosed and treated.
• Symptoms do not always appear right away, so even a mild head injury should be evaluated promptly.
• When a brain injury is caused by negligence, medical records, accident evidence, and expert review help support a legal claim.spi

A serious head injury can change the direction of a person’s life in a matter of seconds. What are the different types of brain injuries? That question often comes up in the days or weeks following an accident, when symptoms begin to surface, and the full impact is not yet clear. In Portland, these injuries are frequently tied to car crashes, falls, and other preventable events, which makes understanding both the medical and legal aspects especially important. Working with a Portland brain injury lawyer can help bring clarity to your situation when negligence may be involved, and at Paulson Coletti, we work closely with individuals and families facing these challenges.

Brain injuries are typically divided into traumatic brain injuries caused by an external force, such as a crash or fall, and acquired brain injuries that develop from internal conditions like oxygen deprivation or stroke, with effects ranging from mild concussions to severe injuries that interfere with normal brain function.

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The Most Common Types of Traumatic Brain Injuries

Traumatic brain injuries occur when a sudden impact or movement affects the brain. While each case is different, several types appear more often in injury claims.

Concussions are among the most common. Even though they are often described as mild, they can interfere with memory, focus, and emotional stability. Contusions involve bruising within the brain and may require observation if swelling becomes a concern. Diffuse axonal injuries are more serious and result from rapid motion that disrupts the brain’s internal connections. Penetrating injuries, though less common, involve an object entering the skull and are typically associated with more extensive damage.

Looking at what are the different types of brain injuries within this category helps put into perspective how varied these conditions can be and why proper evaluation matters.

Closed vs. Open Head Injuries: What’s the Difference

Brain injuries are often described as either closed or open, based on whether the skull remains intact. Closed head injuries happen without a break in the skull and are common in collisions and falls, where force alone causes internal damage. Open head injuries involve a fracture or penetration, exposing brain tissue and increasing the risk of complications such as infection.

This distinction matters because it shapes how the injury is identified and treated. Closed injuries may not be immediately obvious, while open injuries typically require urgent medical intervention.

Why Some Brain Injuries Are Harder to Detect

Not all brain injuries are immediately visible. Some develop gradually, with symptoms appearing hours or even days later. Subtle changes in thinking, delayed headaches, or mood shifts can make early recognition difficult.

Medical providers often rely on imaging and continued observation to confirm a diagnosis. According to the Mayo Clinic, symptoms may not appear right away, which highlights the importance of seeking medical care after any significant head impact.

Mild, Moderate, and Severe Brain Injuries Explained

Brain injuries are also grouped by severity, which influences both treatment and long-term expectations. Mild injuries, such as concussions, may involve short-term confusion or a brief loss of consciousness. Moderate injuries often bring longer periods of disorientation, ongoing headaches, and noticeable cognitive changes. Severe injuries can lead to extended unconsciousness, lasting neurological impairment, and the need for long-term care.

Each level carries different implications, making it important to understand what are the different types of brain injuries when considering both recovery and potential legal claims.

Symptoms and Long-Term Effects of Different Brain Injuries

The effects of a brain injury can vary widely depending on the area of the brain involved and the severity of the trauma.

Common symptoms may include:

• Headaches and dizziness
• Memory issues or trouble concentrating
• Sensitivity to light or sound
• Changes in mood, such as irritability or anxiety

These symptoms may evolve over time and differ based on the types of brain injuries involved.

Long-term effects can continue well beyond the initial event. Some people experience:

• Ongoing cognitive difficulties
• Challenges returning to work or daily routines
• Strain in personal relationships

These lasting effects often require continued care and support.

When a Brain Injury May Be Caused by Negligence

Some brain injuries occur under circumstances that could have been prevented. Negligence arises when a person or entity fails to exercise reasonable care, resulting in harm. This may involve unsafe conditions, careless driving, or failures in workplace safety.

Under Oregon law, establishing liability requires showing that a duty of care existed, that it was breached, and that the breach directly caused the injury. The concept of negligence outlines how responsibility is evaluated in these situations.

Building a claim involves reviewing how the incident occurred, identifying who may be responsible, and examining whether appropriate safety measures were in place. Medical records, reports, and other evidence all help demonstrate the full impact of the injury.

What to Do After a Suspected Brain Injury

The steps taken after a head injury can affect both recovery and any future claim. It is important to approach the situation carefully:

• Seek medical attention as soon as possible, even if symptoms seem minor
• Follow recommended treatment and attend all follow-up visits
• Keep track of symptoms and any changes over time
• Preserve evidence from the incident, including photos or witness details
• Avoid making statements about fault before all facts are known

Prompt action can help protect both your health and your ability to pursue a claim.

Contact a Portland Brain Injury Lawyer About Your Case

A brain injury can affect nearly every part of daily life, from work to personal relationships. Having clear guidance during this time can make a meaningful difference.

At Paulson Coletti, we work with individuals and families across Portland to evaluate claims, gather evidence, and pursue fair compensation. Call 503-226-6361 to discuss your situation and understand the next steps.