Understanding a Mild Traumatic Brain Injury

What is a mild traumatic brain injury? It is a brain injury caused by a bump, blow or jolt to the head or body that briefly disrupts how the brain works. This page explains what the term means, how doctors grade severity, what symptoms look like, and why symptoms can last longer than expected.

What a mild traumatic brain injury means

The brain floats in fluid inside the skull. When the head stops suddenly, takes a hard blow, or is shaken, the brain can strike the skull or move within it. That movement can disrupt normal brain function for a short time, even when there is no open wound or broken bone.

The word “mild” describes how the injury first presents. It does not describe how serious symptoms feel, and it does not predict how long they will last. A person can be dazed or confused after the impact, or have no clear memory of the moment it happened.

Concussion is another name for this injury. The American Association of Neurological Surgeons describes concussion and mild traumatic brain injury together as one condition. So you may hear either term from a doctor, and both point to the same kind of injury. A concussion can also happen when the head never strikes anything, which is why symptoms may not seem connected to the event at first.

How TBI severity is classified

Doctors classify a traumatic brain injury as mild, moderate or severe based on the person’s condition around the time of injury. This grade is a snapshot taken at one point in time. It is not a forecast of recovery.

Clinicians commonly look at three things. They check how alert the person is and whether consciousness was lost. They ask about memory loss around the event. They also look for nerve or neurological findings during an exam.

Imaging such as a CT scan or MRI can add information. Scan results may not match the first grade, so a mild label does not mean nothing else is wrong. Doctors combine the exam, the history and the scans to form the full picture.

Traumatic brain injuries can be mild or severe. They may occur along with broken bones, burns or limb loss, which doctors call polytrauma, according to VA Southern Arizona Health Care. That is one reason a crash victim with a head injury often has several injuries to track.

Common causes of mild brain injury

Common causes include motor vehicle crashes, falls, sports and recreation, being struck by or striking an object, and assaults. Each one can jolt the head or body hard enough to disturb brain function.

In a crash, the head can hit the steering wheel, a window or a pillar. The brain can also move inside the skull during a sudden stop or fast acceleration, even when the head never touches anything. This is why a person can be hurt in a crash without a visible head wound.

Crashes involving large trucks and other commercial vehicles can produce strong forces. The firm handles car accidents, truck accidents and commercial vehicle accidents, including cases where a head injury is part of the claim. Whatever the cause in Virginia or elsewhere, the same questions about severity, symptoms and medical follow-up apply.

Symptoms of a mild traumatic brain injury

Symptoms of a mild traumatic brain injury often fall into four groups: physical, thinking, sleep and mood. The U.S. Department of Veterans Affairs health library notes that these symptoms can be hard to predict and cover a wide range.

Physical symptoms include headache, dizziness, nausea, balance trouble, and sensitivity to light or noise. Thinking symptoms include confusion, slowed thinking, and trouble with memory or concentration. Sleep changes can mean sleeping more or less than usual.

Symptoms do not always appear right away. Some show up hours or days after the injury. A mild injury can still cause symptoms that interfere with work, school or daily routines.

If new symptoms follow a head impact, a medical evaluation is the right next step.

Can a brain injury affect behavior and aggression?

Some people notice changes in mood, irritability or impulse control after a brain injury, and these changes can follow a mild injury too. Doctors ask about mood and behavior as part of any evaluation.

Family members often notice these shifts before the person does. Writing down what they see, when it started and how often it happens gives the medical team useful detail. Relationships, work and daily life can all feel the strain when mood changes, so naming the change early helps.

These changes do not follow one pattern for every person. A medical team looks at each person’s history, exam and symptoms before drawing conclusions. A person who notices sudden anger, irritability or trouble controlling impulses should report those changes to their medical team promptly.

Why some mild brain injuries last longer than expected

Symptoms can last longer than people expect. Doctors use the term post-concussion symptoms for symptoms that persist after the injury. A randomized trial reported in PubMed Central studied persistent post-concussion symptoms after mild TBI. Its authors describe the treatment evidence for these symptoms as limited.

Several things can make the picture harder to read. Another head impact before symptoms settle can complicate recovery. Stress, poor sleep and pain can also make symptoms harder to sort out. Some people also keep headaches that linger after the impact.

For that reason, medical teams track symptoms over time rather than relying on a single visit. Changes from one appointment to the next give doctors important clues about what is happening.

What to do after head trauma

After any head impact, the first step is a prompt medical evaluation, even when the person feels fine. Early symptoms can be mild or easy to miss.

When you see a medical provider, describe how the injury happened. Say whether there was any loss of consciousness, and list every symptom noticed since. Be specific about timing.

A simple written log helps. Note the date, each symptom, how strong it felt, and any activity you could not do that day. Bring the log to follow-up visits.

Virginia requires a driver involved in a crash with injury or death to stop and report it to police immediately (Va. Code §§ 46.2-371, 46.2-894). The statute also requires the driver to give reasonable help to anyone hurt, including taking that person to a doctor or hospital when treatment is apparently needed or requested, under Va. Code § 46.2-894. The two-year period discussed in the next section is the deadline to file a lawsuit, not the deadline to report a crash.

Medical records and the timing of a legal claim

Medical records, imaging and treatment history form the factual record of a brain injury after a crash. They show when symptoms began, what was reported, and how treatment went. Keeping appointment notes and the symptom log in one place makes the timeline clearer later.

Virginia generally allows two years from the date of injury to file a personal injury lawsuit (Va. Code § 8.01-243(A)); the clock runs from the date of injury, not the date of discovery, with narrow exceptions.

Claims against a county, city or town can require a written statement filed within six months of the injury, under Va. Code § 15.2-209. Under Va. Code § 15.2-209(A), a negligence claim against a county, city, or town is forever barred unless a written statement of the nature of the claim, including the time and place of the injury, is filed within six months after the cause of action accrued. The statute also provides an exception if the locality’s attorney, chief executive, or mayor, or any insurer or entity covering the claim, had actual knowledge of the claim within that same six-month period, and subsection G states that the section is mandatory and strictly construed. Va. Code § 15.2-209 reads: “Every claim cognizable against any county, city, or town for negligence shall be forever barred unless the claimant or his agent, attorney, or representative has filed a written statement of the nature of the claim, which includes the time and place at which the injury is alleged to have occurred, within six months after such cause of action accrued.” Because some notice rules run out sooner, the timing should be reviewed promptly.

Frequently asked questions