Dr Željko Kojadinović — NEUROHIRURGIJA I LEČENJE BOLA
Dr Zeljko Kojadinovic — Pain Treatment & Neurosurgery
Author:
Dr. Zeljko Kojadinovic, MD, PhD
— Neurosurgeon and Pain Management Specialist
Specialized Experience:
30 years of clinical expertise in neurosurgery and neurocritical care.
Last medically reviewed:
June 03, 2026
Seizures can occur after many types of severe brain injury — including traumatic brain injury (TBI), intracerebral hemorrhage (ICH), subarachnoid hemorrhage (SAH), intraventricular hemorrhage (IVH), or a combination of these. A seizure happens when groups of brain cells start sending abnormal electrical signals. This can appear as shaking of the body, stiffening, staring spells, sudden unresponsiveness, or brief episodes where the patient seems “not there.”
In the ICU, seizures may be hard to recognize because patients are often sedated, connected to a ventilator, or unable to move. That is why doctors sometimes use continuous EEG monitoring to detect “silent” seizures that cannot be seen from the outside. If a seizure is confirmed or strongly suspected, doctors typically start antiepileptic medications to protect the brain from additional injury.
Most early seizures after brain injury do not mean the patient will develop chronic epilepsy. They are often a temporary reaction to swelling, bleeding, irritation of brain tissue, or metabolic changes. With proper monitoring and treatment, seizures can usually be controlled effectively, and they rarely change the long-term recovery path by themselves.
Preventive Antiepileptic Treatment After TBI, ICH, SAH, or IVH
After severe injuries affecting the cerebral cortex (the outer layer of the brain), doctors often give antiepileptic medication for the first 7 days. This is called early seizure prophylaxis. The medications most commonly used for 7-day seizure prevention are levetiracetam (Keppra) and, in some cases, phenytoin. Most modern ICU teams prefer levetiracetam because it is easier to dose, has fewer interactions, and does not require blood-level monitoring.
The goal is simple: during the first days after a brain injury, the tissue is irritated, swollen, and unstable — and that is the period when early seizures are most likely to occur.
- If the patient has no seizures during those 7 days, the medication is usually stopped.
- If a seizure occurs, treatment is continued longer, and the medical team decides how long based on EEG findings, recovery pattern, and the type of brain injury.
This 7-day rule applies mainly to injuries that affect the cortex — for example:
- large traumatic contusions,
- cortical bleeding (ICH touching the cortex),
- traumatic SAH or IVH with cortical irritation,
- penetrating injuries,
- and skull fractures with underlying cortical damage.
What About Depressed Skull Fractures?
Seizures can also appear in patients with depressed (impressive) skull fractures, but the risk comes not from the fracture itself, but from the brain injury underneath it.
If the bone fragment has pushed inward and bruised the cortex, that cortical lesion is what increases the seizure risk — not the broken bone.
Because of that, these patients also often receive the same 7-day seizure prophylaxis, unless there are additional findings that require longer treatment.
Why This Matters for Families
Early seizures are frightening, but they do not automatically mean long-term epilepsy. In most cases, they reflect temporary irritation and swelling. With proper ICU monitoring and treatment, outcomes are usually stable and manageable.
Why Brain Bleeds, Surgery or Trauma Can Cause Seizures
Seizures after brain injury usually happen because injured brain tissue becomes electrically unstable. Blood, swelling, bruising, reduced oxygen, irritation of the cerebral cortex, infection, metabolic changes, or surgical manipulation can all make nerve cells fire abnormally. This is why seizures may appear after traumatic brain injury (TBI), intracerebral hemorrhage (ICH), subarachnoid hemorrhage (SAH), intraventricular hemorrhage (IVH), or brain surgery.
Brain bleeds can cause seizures because blood is irritating to the brain surface and surrounding tissue. The risk is higher when bleeding or contusion involves the cerebral cortex, because the cortex is the part of the brain most likely to generate seizures. A deep hemorrhage may have a lower seizure risk than a cortical or lobar bleed, but the overall risk still depends on swelling, pressure, hydrocephalus, metabolic problems, and the patient’s neurological condition.
After brain surgery, seizures may occur because the operated brain area is temporarily irritated by blood products, swelling, manipulation, or healing tissue. In many patients, these are early provoked seizures rather than permanent epilepsy. This is why ICU teams often use antiepileptic medication for a limited period, monitor the patient clinically, and sometimes use EEG when seizures are suspected but not visible from the outside.
An online neurosurgical second opinion may help clarify what new seizures can mean after brain injury or surgery, how EEG findings are interpreted, and what treatment choices are usually considered.
If your family is dealing with one of these conditions, you may find these detailed guides helpful:
-
Traumatic Brain Injury (TBI) – diagnosis, treatment options, ICU phases, and recovery.
Read the full guide → -
Intracerebral Hemorrhage (ICH) – when surgery helps and what families should expect in the first days.
Family explanation → -
Ruptured Aneurysm & Subarachnoid Hemorrhage (SAH) – stabilization, treatment, ICU course, and prognosis.
Read more → -
Epilepsy Surgery — when it is the right option – a clear explanation of who may benefit, how evaluations are done, and realistic outcomes.
Learn more →
Frequently Asked Questions about Seizures After Brain Injury, Brain Bleed or Brain Surgery
What causes seizures after brain injury?
Seizures after brain injury usually happen because injured brain tissue becomes electrically unstable. Blood, swelling, bruising, reduced oxygen, infection, metabolic disturbance, surgery, or irritation of the cerebral cortex can make nerve cells fire abnormally. This may happen after traumatic brain injury (TBI), intracerebral hemorrhage (ICH), subarachnoid hemorrhage (SAH), intraventricular hemorrhage (IVH), stroke, skull fracture, or brain surgery. In ICU patients, seizures may be visible as shaking or stiffening, but they may also be silent and detected only by EEG monitoring.
Why can a brain bleed cause seizures?
A brain bleed can cause seizures because blood irritates the surrounding brain tissue and may disturb normal electrical activity. The seizure risk is usually higher when bleeding reaches or irritates the cerebral cortex, which is the outer brain layer most likely to generate seizures. This is why lobar hemorrhage, traumatic contusions, cortical SAH, IVH with cortical irritation, and some postoperative bleeding may trigger seizures. The risk also depends on swelling, pressure, hydrocephalus, oxygen levels, fever, infection, sodium imbalance, and the patient’s overall neurological condition.
Are seizures common after brain surgery?
Seizures can occur after brain surgery, but they are not inevitable. The risk depends on the reason for surgery, the brain area involved, whether the cortex was irritated, whether there was bleeding or swelling, and whether the patient already had seizures before the operation. Early seizures after craniotomy, brain tumor surgery, hematoma evacuation, abscess surgery, or trauma surgery may be provoked by temporary irritation rather than permanent epilepsy. Doctors usually assess the type of surgery, CT or MRI findings, neurological recovery, and EEG results before deciding how long antiepileptic medication is needed.
Why do doctors give Keppra after a brain bleed or brain injury?
Doctors often give Keppra, also called levetiracetam, after a brain bleed or severe brain injury to reduce the risk of early seizures. Early seizures are more likely during the first days after trauma, hemorrhage, cortical irritation, swelling, or brain surgery. Keppra is commonly used because it is easy to dose, has fewer drug interactions than older medications, and does not usually require blood-level monitoring. The goal is prevention during the unstable early phase, especially when the injury affects the cerebral cortex or when seizures would add extra stress to an already injured brain.
How long do patients usually take Keppra after TBI, ICH, SAH or IVH?
Many patients receive Keppra or another antiepileptic medication for about 7 days after severe traumatic brain injury, cortical brain bleeding, traumatic SAH, IVH with cortical irritation, depressed skull fracture with brain injury, or brain surgery. This is called early seizure prophylaxis. If no seizure occurs, the medication is often stopped after that early high-risk period. If a seizure occurs, if EEG shows seizure activity, or if the brain lesion remains highly irritating, treatment may continue longer. The final decision depends on the injury type, EEG, imaging, recovery pattern, and seizure history.
Do early seizures after brain injury mean lifelong epilepsy?
Early seizures after brain injury do not automatically mean lifelong epilepsy. Many early seizures are provoked by temporary swelling, bleeding, irritation of the cortex, metabolic disturbance, fever, infection, or the acute stress of brain injury. These seizures may stop once the brain stabilizes and the early risk period passes. The risk of later epilepsy is higher when there is cortical scarring, penetrating injury, severe contusion, repeated seizures, abnormal EEG, or a structural brain lesion that remains irritating. This is why doctors separate early provoked seizures from late unprovoked seizures and long-term post-traumatic epilepsy.
Can seizures cause a brain bleed or brain damage?
In most ICU situations, the brain bleed or brain injury causes the seizure, not the other way around. A typical short seizure does not usually cause a brain bleed by itself. However, a seizure may sometimes lead to trauma, falls, oxygen problems, or very rarely contribute to complications in vulnerable patients. Prolonged seizures or status epilepticus can injure the brain because they increase oxygen demand, raise metabolic stress, and may reduce normal recovery. This is why prolonged, repeated, or silent seizures after brain injury are treated seriously and may require urgent medication and EEG monitoring.