A person walks out of an emergency department with a normal CT scan, a discharge sheet, and instructions to follow up if anything changes. Three weeks later they cannot get through a workday without a headache, they have started avoiding the grocery store because the lighting makes them nauseated, and their spouse has noticed they have become short-tempered in a way that does not resemble them.
This sequence is common after collisions, and it is one of the most consistently underdiagnosed outcomes in injury medicine. The Centers for Disease Control and Prevention has long noted that traumatic brain injury contributes to a substantial share of injury deaths and disability in the United States, and that mild cases in particular go unrecognized. This article is general information and not medical advice.
A Concussion Does Not Require Hitting Your Head
The most persistent misconception about brain injury is that it requires impact. It does not. A concussion is caused by rapid acceleration and deceleration of the head, which allows the brain to move within the skull and strain the axons that carry signals between regions.
A rear-end collision at 25 miles per hour generates that motion whether or not the head strikes anything. So does a side impact at a roundabout entry. So does the whipping motion of a vehicle spinning after contact. The absence of a bump, a laceration or a loss of consciousness tells you very little, and most concussions involve no loss of consciousness at all.
This is also why the phrase in a crash report matters less than people think. The reporting officer is documenting the collision, not conducting a neurological assessment, and the box for injuries reflects what was visible and reported at the scene by someone who had been running on adrenaline for 20 minutes.
Why Emergency Departments Miss It
Emergency medicine is triage medicine, and it is good at what it is designed to do. A CT scan in the trauma bay is looking for bleeding, swelling and skull fracture, the findings that require intervention within the hour. A mild traumatic brain injury involves microscopic axonal injury that does not appear on standard imaging at all.
So the scan reads normal, and it is normal, in the sense that nothing requires surgery. The patient hears no bleeding and reasonably translates that to no brain injury. If they also have a fractured wrist or lacerations, attention goes there, because those hurt immediately and visibly.
The symptoms that define a concussion frequently take 24 to 72 hours to develop, by which point the patient is home and no longer being observed by anyone with the training to connect them.
The Symptoms Look Like Ordinary Life
This is the central difficulty. Post-concussive symptoms rarely announce themselves as neurological. They present as headaches, fatigue, difficulty concentrating, word-finding problems, irritability, anxiety, disrupted sleep, dizziness, and sensitivity to light and noise.
Every one of those has a mundane explanation. Someone recovering from a crash is stressed, in pain, sleeping badly and dealing with insurance calls. Attributing the fog to that is the reasonable interpretation, and it is often what family members and even primary care providers do initially.
The signs that tend to break through are functional rather than symptomatic. The person who has always managed the household finances starts making errors. The nurse who has run the same shift for a decade begins double-checking work she never had to double-check. The parent who cooked without thinking about it now needs the recipe in front of them. Those observations, made by people who know the person well, frequently do more to establish a brain injury than any single test result.
Why the Delay Damages the Claim
From an insurer’s perspective, a treatment gap is the most useful fact in the file. If the emergency room visit occurred on March 1 and the first neurological complaint appears on April 10, the argument writes itself. The injury was not caused by the crash, or it was not serious, or the person is exaggerating for financial reasons.
That argument is medically weak, since delayed symptom onset is a well-documented feature of mild traumatic brain injury, but it is rhetorically effective and it lowers settlement values every day. The countermeasure is documentation rather than argument.
Practical steps help more than they should have to. Report every symptom at every appointment, including the ones that feel too vague to mention. Ask for a referral to a neurologist or a concussion clinic rather than waiting for one. Keep a dated symptom journal, which is more credible than reconstructed memory. Ask a spouse, a manager or a close coworker to write down what they have observed while the observation is current. Anyone building this record while also managing a serious injury benefits from working with a traumatic brain injury lawyer in Indianapolis who knows which evaluations actually support a claim.
Force Matters, Which Is Why Commercial Vehicle Crashes Are Different
Injury severity scales with energy transfer, and a collision involving a tractor-trailer transfers energy on a different order of magnitude than a two-car crash. Central Indiana sees a great deal of that traffic. Interstates 65, 69, 70 and 74 converge on the I-465 loop, and distribution corridors run through Plainfield, Whitestown, Lebanon and Greenwood.
Brain injuries arising from those collisions tend to be more severe and more likely to involve a hospital stay, but the underlying documentation problem remains. A patient with a pelvic fracture and a concussion will have the fracture treated meticulously and the concussion mentioned once at discharge. Because semi-truck accident claims in Indiana involve federal safety regulations, corporate defendants and evidence that is destroyed on retention schedules, the medical and the investigative work have to proceed on parallel tracks from the beginning.
What a Brain Injury Actually Costs
Medical bills are the smallest part of the picture in many cases. A persistent mild traumatic brain injury affects earning capacity, because the work most people do is cognitive. It affects relationships, because irritability and withdrawal strain marriages. It affects independence, because driving, managing medication and handling finances all require executive function.
Indiana permits recovery for medical expenses incurred and reasonably expected, lost wages and diminished earning capacity, pain and suffering, and loss of enjoyment of life. Establishing the future components requires a physician willing to state a prognosis and often a vocational assessment. That work takes months, which is one more reason the two year filing deadline under Indiana Code 34-11-2-4 arrives faster than it appears to.
Frequently Asked Questions
Can you have a concussion without hitting your head?
Yes. A concussion results from rapid acceleration and deceleration of the head, which moves the brain inside the skull. Direct impact is not required, and most concussions involve no loss of consciousness. Whiplash-type motion in a rear-end or side-impact collision is sufficient to cause one.
Why did my CT scan come back normal if I have a brain injury?
Standard CT imaging detects bleeding, swelling and fractures, which are the findings that require emergency intervention. Mild traumatic brain injury involves microscopic damage to nerve fibers that does not appear on conventional imaging. A normal scan means no emergency surgical finding. It does not rule out a concussion.
How long after a car accident can concussion symptoms appear?
Symptoms commonly emerge 24 to 72 hours after the collision and can continue developing over the following week. Delayed onset is a recognized feature of mild traumatic brain injury and does not indicate that the symptoms are unrelated to the crash, though insurers routinely argue otherwise.
What is the average settlement for a traumatic brain injury?
There is no useful average. Outcomes depend on the severity and permanence of the deficits, the strength of the medical documentation, the effect on earning capacity, the fault allocation, and the insurance available. A well-documented mild injury with lasting cognitive effects can be worth substantially more than a poorly documented moderate one.
How do you prove a mild traumatic brain injury?
Proof is usually built from consistent contemporaneous records rather than a single test. Neuropsychological testing, treatment notes documenting symptoms over time, a dated symptom journal, and statements from family members and coworkers describing specific changes in function all contribute. The strongest cases show a clear before-and-after picture drawn by people with no financial interest in the outcome.