Yes, you can develop epilepsy at any point in your life

Epilepsy is not something you are born with in most cases. About 70% of people diagnosed with epilepsy develop it after birth, at any age from childhood through old age. A seizure disorder can start suddenly in your 20s, 40s, or 60s with no warning. The brain's electrical activity can change due to injury, illness, or other factors that develop over time.

The risk of developing epilepsy is not equal across all ages. Children and older adults face higher risk than middle-aged adults, but the reasons differ. In children, brain development and infections play a larger role. In older adults, stroke and dementia are common causes. Understanding what can trigger epilepsy helps you recognize warning signs and know when to seek medical attention.

Key Takeaways

  • Most people with epilepsy develop it after birth, not from birth, and it can start at any age.
  • Head injury, stroke, brain infection, and brain tumors are the most common causes of acquired epilepsy in adults.
  • Some people have one seizure and never have another; epilepsy is diagnosed only after a second unprovoked seizure or specific brain imaging findings.
  • Older adults are at higher risk for developing epilepsy, particularly after stroke or as a symptom of dementia.
  • If you have a seizure, seeing a neurologist can determine whether you have epilepsy or whether the seizure was a one-time event.

What causes epilepsy to develop in adults

Head injury is one of the most common causes of epilepsy in adults. A traumatic brain injury from a car accident, fall, or blow to the head can damage brain tissue and change how neurons fire. The seizures may start immediately after the injury or months or years later. Even a moderate head injury increases your risk.

Stroke is the leading cause of epilepsy in older adults. When blood flow to the brain is blocked or a blood vessel ruptures, brain cells die. The scarring that follows can create an area where seizures start. Stroke survivors have roughly a 10% to 15% chance of developing epilepsy at some point.

Brain tumors, both cancerous and non-cancerous, can cause epilepsy by pressing on brain tissue or disrupting electrical signals. Brain infections such as meningitis or encephalitis can leave permanent damage that leads to seizures. Untreated infections carry higher risk than those caught and treated early.

Other causes include high fever (particularly in children), alcohol withdrawal, drug use, and metabolic disorders. Some people develop epilepsy after a severe illness or as a side effect of certain medications. In about one-third of adults diagnosed with epilepsy, doctors cannot identify a specific cause.

Why age matters for epilepsy risk

Children under age 5 have the highest overall risk of developing epilepsy, often due to fever, infections, or developmental brain differences. However, the causes in young children are often different from those in adults. A febrile seizure (seizure caused by high fever) does not always lead to epilepsy.

Adults aged 60 and older face a second peak in epilepsy risk, nearly as high as the risk in young children. In this age group, stroke is the most common preventable cause. Dementia, Alzheimer's disease, and other neurodegenerative conditions also increase risk. Older adults may also be taking multiple medications that interact and lower the seizure threshold.

Middle-aged adults (roughly 20 to 50 years old) have the lowest risk of developing epilepsy, unless they have a specific trigger such as head injury or brain tumor. This does not mean it cannot happen—it means the statistical likelihood is lower than at the extremes of age.

The difference between a seizure and epilepsy

Having one seizure does not mean you have epilepsy. A single seizure can happen for many reasons: high fever, low blood sugar, extreme stress, sleep deprivation, or alcohol withdrawal. These are provoked seizures—they have a clear trigger.

Epilepsy is diagnosed when you have had two or more unprovoked seizures (seizures without an obvious trigger), or one unprovoked seizure plus brain imaging or EEG findings that suggest more seizures are likely. A person who has one seizure from a high fever and never has another seizure does not have epilepsy, even though they experienced a seizure.

This distinction matters because the treatment and long-term outlook are different. A single provoked seizure may not require ongoing medication. Epilepsy typically does. If you have had a seizure, a neurologist can review your medical history, imaging results, and EEG recordings to determine whether you have epilepsy or whether the seizure was a one-time event.

When to see a doctor after a seizure

If you have had a seizure, you should see a doctor even if you feel fine afterward. Go to an emergency room if the seizure lasted more than five minutes, if you had multiple seizures in a row, if you were injured during the seizure, or if you are pregnant. These situations require immediate evaluation.

If you had a brief seizure and recovered fully, you can see your primary care doctor or a neurologist within a few days. Bring someone who witnessed the seizure if possible—their description of what happened helps the doctor understand what occurred. Write down what you remember: what you were doing before it started, how long it lasted, what your body did, and how you felt afterward.

The doctor will ask about your medical history, medications, sleep, stress, and any recent head injuries or illnesses. They may order an EEG (a recording of brain electrical activity) or an MRI or CT scan of your brain. These tests help determine whether you have epilepsy or whether the seizure had another cause.

Reducing your risk of developing epilepsy

You cannot prevent epilepsy entirely, but you can reduce your risk by preventing the conditions that cause it. Wear a seatbelt and helmet during activities like biking or motorcycling to lower your risk of head injury. Follow your doctor's instructions for managing high blood pressure and high cholesterol, which reduce stroke risk.

Treat infections promptly. Meningitis and encephalitis are rare but serious; seek medical care if you have a high fever, stiff neck, severe headache, or confusion. If you drink alcohol, do so in moderation—heavy drinking and sudden withdrawal both increase seizure risk.

Get adequate sleep and manage stress where possible. Sleep deprivation and extreme stress can lower your seizure threshold. If you have been diagnosed with a condition that increases epilepsy risk (such as diabetes or heart disease), work with your doctor to keep it well controlled. These steps do not may provide you will not develop epilepsy, but they reduce the likelihood.

Living with newly diagnosed epilepsy

If you are newly diagnosed with epilepsy, your doctor will discuss medication options. Most people with epilepsy can control seizures with one or more anti-seizure medications. Finding the right medication and dose takes time—your doctor may need to adjust your prescription over weeks or months.

You will need to take your medication exactly as prescribed, even when you have not had a seizure for a long time. Stopping medication suddenly can trigger seizures. Tell your doctor about all other medications and supplements you take, because some interact with anti-seizure drugs.

Certain activities may need to change. Driving restrictions vary by state and depend on how long you have been seizure-free. Swimming and bathing alone carry risk if you have a seizure. Talk with your doctor about what activities are safe for you. Many people with well-controlled epilepsy live full, active lives with few restrictions.

Frequently Asked Questions

Can stress or lack of sleep cause epilepsy to develop?

Stress and sleep deprivation can trigger seizures in people who already have epilepsy, but they do not cause epilepsy to develop in the first place. However, chronic stress and poor sleep may lower your seizure threshold over time, making seizures more likely if you have an underlying brain condition.

Is epilepsy hereditary if I develop it as an adult?

Adult-onset epilepsy is usually not inherited. Most cases in adults result from head injury, stroke, infection, or tumor. Genetic forms of epilepsy typically appear in childhood. If multiple family members have epilepsy, genetic testing may be recommended, but this is less common in adults.

Can you develop epilepsy from a single head injury?

Yes. A moderate to severe head injury can cause post-traumatic epilepsy. Seizures may start within days of the injury or years later. Even a head injury that seemed minor at the time can lead to epilepsy. Anyone with a significant head injury should follow up with a doctor.

What is the difference between epilepsy and a seizure disorder?

Epilepsy and seizure disorder are often used interchangeably, but technically epilepsy is a specific diagnosis: a tendency to have recurrent, unprovoked seizures. A seizure disorder is a broader term that can include single seizures or seizures with a known cause. Your doctor will clarify which diagnosis applies to you.

If I have one seizure, will I definitely develop epilepsy?

No. About 40% of people who have one unprovoked seizure never have another. Your risk of a second seizure depends on the cause of the first one, your age, your brain imaging results, and your EEG findings. A neurologist can discuss your individual risk based on these factors.