By Dr. Claudia Muñoz, MD, MPH — Board-Certified Neurologist & Epileptologist, Medical Expert Witness
Seizures after a head injury raise some of the hardest questions in a traumatic brain injury (TBI) case. Was the seizure caused by the injury? Is this a one-time event or epilepsy? Could something else explain it? As a neurologist and epileptologist, I approach these questions through three things: timing, the injury records, and testing.
A Seizure Is Not the Same as Epilepsy
A seizure is a sudden, abnormal electrical disturbance in the brain. Epilepsy means having a predisposition to having seizures, which can happens for a variety of reasons. TBI is one cause of epilepsy. Many people have a single seizure after a brain injury and never have another, and most people with a brain injury never have a seizure at all.
Early and Late Seizures
Timing is the first distinction:
Early seizure: within the first week after injury. It is considered a symptom of the recent injury and can occur even after a mild injury with normal imaging. About 25% of people with an early seizure have another one months or years later.
Late seizure: more than a week after injury. It is more likely to recur. About 80% of people with a late seizure have another, which is generally what defines epilepsy.
Most seizures after TBI occur in the first days or weeks, but some begin months or even years later. That delay is one reason the full timeline matters.
What Raises the Risk
The published sources point to several factors, mostly tied to the type of injury and its treatment:
Penetrating injury, such as a gunshot wound
Bleeding between the brain and the skull (subdural hematoma) or bruising of brain tissue
Skull fracture that compresses or injures brain tissue
Repeated brain surgery
An early seizure
Older age and a family history of epilepsy
These describe groups of patients. They do not predict what will happen to any one person.
Testing: What It Can and Cannot Show
EEG records the brain's electrical activity. It can be helpful, but a normal EEG does not rule out that a seizure occurred or may occur in the future. It can potentially detect abnormal signals that point to brain dysfunction. EEG changes may or may not appear right after an injury.
CT and MRI show structural injury such as bleeding or scarring. Normal imaging does not rule out seizure or epilepsy.
Video-EEG monitoring at a comprehensive epilepsy center may be used when seizures continue despite medication or the diagnosis is unclear. It is the gold standard for diagnosis and management.
Blood and spinal fluid markers and newer EEG and imaging markers are still being studied and are not established diagnostic tools.
Other Causes and Triggers
A seizure after a head injury is not always caused by the injury. The evaluation also considers:
Epilepsy risk factors such as history of certain illnesses or a family history of epilepsy
Fever, sleep deprivation, and extreme fatigue
Alcohol or drug use
Electrolyte imbalances, such as low sodium or magnesium, or high calcium
Other events that can resemble a seizure
Sorting these out depends on the medical records and a careful history..
Case Evaluation
Timing matters. Early and late seizures answer different questions.
Normal testing does not settle the question. A normal scan or EEG does not rule out seizures, and an abnormal one does not by itself prove the cause.
Individual history matters. Most people with a brain injury never have a seizure, so prior history and other triggers need to be sorted out.
The records carry the weight. Documentation of the injury, the first seizure, witness descriptions, and treatment gives the opinion its foundation, whichever side it supports.
Each case depends on its specific facts and medical history. This article summarizes general clinical information, not an opinion on any specific case.
Work With a Neurologist and Epileptologist Expert Witness
If you are handling a case involving seizures after a head injury, a thorough neurological review of the records, testing, and timeline can clarify what the evidence does and does not support.
I provide independent medical examinations, medical record review, expert report writing, and deposition and trial testimony for plaintiff and defense attorneys handling traumatic brain injury cases.
📩 doctor.claudia@gmail.com | info@drclaudiamunoz.com
Dr. Claudia Muñoz, MD, MPH Neurologist | Epileptologist | Medical Expert Witness
Sources: Englander J, Cifu DX, Diaz-Arrastia R, "Seizures after Traumatic Brain Injury," Arch Phys Med Rehabil, 2014; Epilepsy Foundation, "Traumatic Brain Injury and Epilepsy," epilepsy.com.
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