A concussion after a car accident can be easy to miss. A person does not have to lose consciousness, and symptoms can appear right away or develop over the next several hours or days. Headache, dizziness, nausea, slowed thinking, light sensitivity, irritability, and unusual sleep can all matter.
If you are worried about a concussion, get medical guidance. This article explains warning signs, what recovery commonly looks like, and how to keep an accurate record of symptoms. It is general information, not a diagnosis or a substitute for care from a qualified clinician. Johns Hopkins Medicine provides a clinical overview of concussion causes and symptoms.
First, know the emergency warning signs
Some symptoms after a head injury can signal a more serious problem than an uncomplicated concussion. Call 911 or go to an emergency department if the injured person has a worsening headache, repeated vomiting, a seizure, slurred speech, weakness or numbness, increasing confusion or agitation, unequal pupils, unusual behavior, or marked drowsiness and cannot be awakened.
The CDC’s concussion signs and symptoms guidance also advises urgent evaluation for a change in consciousness or new focal neurologic symptoms. When in doubt, choose safety. Do not drive yourself for emergency care if your symptoms could interfere with driving.
What a concussion can look like after a crash
A concussion is a type of traumatic brain injury caused by a blow or jolt to the head or by a force to the body that makes the head and brain move rapidly. That means a concussion can occur even when the head did not strike the steering wheel, window, or another object.
Symptoms vary from person to person. They often fall into four groups:
- Physical: headache, dizziness, nausea, balance problems, blurred vision, fatigue, or sensitivity to light or noise.
- Thinking and memory: feeling slowed down or foggy, trouble concentrating, or difficulty remembering new information.
- Mood: irritability, nervousness, sadness, or feeling more emotional than usual.
- Sleep: sleeping more or less than usual, drowsiness, or trouble falling asleep.
Loss of consciousness is not required for a concussion diagnosis. It is also common for a person at the crash scene to focus on practical problems and notice the full symptom pattern only after the adrenaline and confusion begin to settle.
The first few days are about medical guidance, not proving toughness
Prompt evaluation gives a clinician a chance to look for dangerous injuries, document the history, and give individualized instructions. Bring someone who saw the crash or noticed changes in your behavior if possible. Tell the clinician about prior concussions, migraines, medications, and any symptoms that existed before the collision.
Current CDC guidance does not call for prolonged, complete inactivity for everyone. A short period of taking it easy is commonly followed by a gradual return to ordinary, nonstrenuous activity as symptoms allow. If an activity brings symptoms back or makes them worse, scale it down and discuss the change with your clinician. The Merck Manual’s concussion overview provides additional background on evaluation and recovery.
Ask for written instructions about returning to work, school, driving, exercise, and other responsibilities. Avoid activities that create a risk of another head impact while you are recovering. Questions about medication, alcohol, sleep, screens, and exercise should be answered by the clinician treating you, because the right advice depends on your symptoms and other health conditions.
A normal CT scan does not rule out a concussion
CT scans and other imaging can be important when a clinician is concerned about bleeding, a skull fracture, or another structural injury. A concussion, however, is primarily a disturbance of brain function and is often associated with normal structural imaging.
That distinction matters. A normal scan can be reassuring about some emergencies, but it does not automatically mean that a person has no concussion. Diagnosis and follow-up can depend on the mechanism of injury, symptoms, neurologic examination, and how the condition changes over time. The MSD Manual explains why imaging may be used to look for structural injury while concussion care remains focused on symptoms and recovery.
Build a symptom timeline you can actually use
A useful record is simple and specific. Start with the collision date and time. Then note when each symptom began, how long it lasted, what made it worse, and what it kept you from doing. Record medical visits, instructions, referrals, missed work, and changes noticed by family members or coworkers.
For example, “headache after lunch, improved after resting in a dark room, returned during a video meeting” is more helpful than a vague note that you felt bad all day. Do not exaggerate, but do not minimize symptoms either. Bring the record to follow-up appointments so the medical history stays consistent and complete.
Keep discharge papers, appointment summaries, prescriptions, and work restrictions together. If fatigue is a major problem, this discussion of fatigue after a concussion explains why it deserves its own record. A persistent headache also deserves attention, particularly when it changes or worsens. Our article on headaches after an auto wreck provides additional context.
Why the connection to the crash still has to be proved
Concussion symptoms are real, but many are not visible on an X-ray or ordinary photograph. An insurer may question whether the collision caused them, especially when the first medical visit was delayed or the injured person had migraines, sleep problems, anxiety, or an earlier head injury.
The strongest answer is usually a careful timeline supported by medical records and people who observed the change. Photos of the vehicles and the interior may help explain the forces involved. A passenger, family member, supervisor, or friend may be able to describe confusion, unusual fatigue, missed work, or a change from the person’s normal behavior.
A Louisiana brain injury lawyer can evaluate how the medical history, collision evidence, insurance coverage, and Louisiana law fit together. That legal review is different from medical treatment. Health decisions should remain with the treating professionals.
Louisiana deadlines depend on the date and type of claim
Louisiana Civil Code article 3493.1 states that delictual actions are generally subject to a two-year prescriptive period beginning on the day the injury or damage is sustained. The article took effect July 1, 2024. The date of the collision matters, and different deadlines or procedures can apply to older incidents, government defendants, federal claims, medical malpractice, maritime matters, and other special situations.
For example, a federal claim may require an administrative claim before suit under 28 U.S.C. section 2675, with presentment rules addressed in 28 C.F.R. Part 14. Do not use a general article to calculate the last day to act in a particular case. If a deadline may matter, have the incident date, possible defendants, and governing law checked promptly.
What to do next
Put health first. Seek emergency care for danger signs, follow the instructions from your clinician, and arrange follow-up if symptoms worsen or are not improving. Keep an honest symptom record and save the documents that explain both the injury and its effect on daily life.
If you want a legal review of a Louisiana crash claim, call (225) 500-5000 or use the site’s contact form. A consultation can address evidence, insurance issues, and deadlines without replacing medical care.