Epilepsy is not one single condition. Rather, it is defined as a spectrum of disorders that involve abnormal activity within the brain. “Epilepsy” means the same thing as the term “seizure disorders.” In epilepsy, abnormal brain waves disturb electrical activity, leading to seizures. Symptoms of epileptic seizures include having unusual sensations or emotions, behaving in unusual ways, or experiencing convulsions or loss of consciousness. Brain damage, illness, and irregular brain development can all cause abnormal brain waves that lead to seizures.

Approximately half of all people who have had one seizure for an unknown reason will have another, typically within six months. However, in order to be diagnosed with epilepsy, a person must have had more than one seizure, and doctors must consider it likely that they will continue to have seizures. When a person has a seizure that lasts for more than five minutes, or a person has more than one seizure within a five-minute period (without returning to consciousness between the seizures), it is called “status epilepticus.”

Some forms of epilepsy last for a limited time, although the condition is often lifelong. Although there is currently no cure for epilepsy, there are many treatments available for the condition. About 70 percent of people with seizures can control them with proper diagnosis and use of medication.

There are many different types of seizures, and some people with epilepsy will experience more than one type. Some examples of seizure types include:

• Absence seizures
• Generalized tonic-clonic seizures
• Atonic (or akinetic) seizures

The History of Epilepsy

People have been aware of epilepsy and seizures for millennia. A Babylonian medical textbook made up of 40 tablets dating to 2000 B.C. contains a chapter that accurately describes many of the different types of seizures known today. However, seizures were thought to be supernatural in cause — each seizure type was associated with a different evil spirit or angry god — so the treatments prescribed were spiritual.

Epilepsy in Ancient Greece

The word "epilepsy" comes from the Greek word “epilepsia,” meaning “to seize" or “to take hold of.” By the 5th century B.C., the Greeks still considered epilepsy a "sacred” disease. Yet the renowned ancient physician Hippocrates described epilepsy as a brain disorder. This was a radical idea for the time. He recommended physical treatments while also recognizing that if the seizures became chronic, the disorder was incurable.

Despite Hippocrates’ writings, epilepsy continued to be considered a supernatural condition for the next two millennia. People with epilepsy were subjects of immense social stigma, treated as outcasts, and even punished as witches. In many places, people who suffered seizures were prevented from going to school, working, marrying, and having children. There were a few people with prominent positions thought to have had epilepsy — including Julius Caesar, Tsar Peter the Great of Russia, Pope Pius IX, and Fyodor Dostoevsky — but most people with epilepsy were prevented from living as full members of society.

Epilepsy in the 14th Century and Beyond

During the Renaissance, some scientists tried to prove epilepsy was a physical, not spiritual, illness. Then, in the 19th century, neurology became a recognized medical discipline and the idea of epilepsy as a brain disorder became normal in North America and Europe. In 1857, Sir Charles Lacock introduced bromide of potassium as the first antiepileptic drug (AED).

In 1873, a British neurologist named John Hughlings Jackson first described epilepsy as we understand it today. Jackson showed that seizures are caused by sudden, brief electrochemical discharges of energy in the brain. In 1909, the International League Against Epilepsy was founded as a global professional organization of epileptologists.

By the 1920s, Hans Berger, a German psychiatrist, had developed the electroencephalogram (EEG) to measure brain waves. It showed that each type of seizure is associated with a different brain wave pattern. The EEG also aided in the discovery that specific sites in the brain were responsible for seizures and expanded the potential for surgical treatments. Surgery became a more widely available option by the 1950s.

The Development of Antiepileptic Drugs

The medication phenobarbital was identified as an AED in 1912, and phenytoin (sold under the brand names Dilantin and Phenytek) was developed in 1938. Carbamazepine (sold under various brand names, including Carbatrol, Epitol, Equetro, and Tegretol) was identified in 1953. These drugs have since been approved by the U.S. Food and Administration (FDA) and continue to be used today.

An accelerated drug-discovery process began in the 1970s with the creation of the Anticonvulsant Screening Program, sponsored by the U.S. National Institutes of Health’s National Institute of Neurological Disorders and Stroke. The program helped scientists gain a better understanding of the brain and epilepsy. Scientists have strived to reduce serious side effects associated with the use of older AEDs through drug-development processes.

Levetiracetam (Keppra) was approved by the U.S. Food and Drug Administration (FDA) in 1999. Several newer drugs have been introduced over the past 20 years, including:

• Brivaracetam (Briviact)
• Clobazam (Onfi, Sympazan)
• Eslicarbazepine (Aptiom)
• Lacosamide (Vimpat and Motpoly XR)
• Perampanel (Fycompa)
• Topiramate (sold under several brand names, including Eprontia, Qudexy XR, and Topamax)

Other promising medications are also in the pipeline.

Learn more about treatments for epilepsy, which extend beyond AEDs to surgery, devices, and lifestyle changes.

Social Stigma

The stigma around epilepsy has lessened as more people are able to effectively treat their seizures. However, epilepsy largely remains an “invisible” illness. Millions of people in developing countries do not have access to AEDs, and stigma and discrimination are still widespread, especially in places where people still believe that seizures have a supernatural cause.

How Common Is Epilepsy?

Epilepsy affects 1 percent of adults in the United States, according to the Centers for Control and Disease Prevention (CDC) and around 50 million people worldwide, making it one of the most common neurological disorders. Approximately 45,000 children under the age of 18 are diagnosed with epilepsy every year in the U.S., and roughly 10.5 million children worldwide live with epilepsy.

People of all backgrounds, races, ethnicities, and ages can be affected by epilepsy. The incidence of epilepsy seems to be slightly higher in men compared to women, according to the journal Neuroepidemiology. Epilepsy is most common in young children and older adults.

Among people of different ethnic and racial backgrounds, according to the Epilepsy Foundation:

• Epilepsy occurs more frequently in people of Hispanic background compared to non-Hispanics.
• Active epilepsy (where seizures are not fully controlled) is more prevalent in white people than in Black people.
• The lifetime prevalence of epilepsy is higher in Black people than in white people.
• About 1.5 percent of Asian Americans are currently living with epilepsy.

Diagnosing Epilepsy

Neuroimaging capabilities have improved over the past few decades. Magnetic resonance imaging (MRI), computer tomography (CT) scans, and other techniques are able to detect more and more subtle brain lesions responsible for epilepsy.

Read more about diagnosing epilepsy.

Causes of Epilepsy

Causes of epilepsy include a wide variety of brain-related issues such as structural damage, infectious diseases (such as encephalitis), and genetic anomalies. Other risk factors for epilepsy include:

• Age
• Family history of seizures
• Head injuries, such as traumatic brain injury
• Seizures during childhood

Read more about the causes of seizures and epilepsy.

Types of Seizures

There are many types of epilepsy. Seizures are broken into three general categories:

• Focal seizures can be categorized by whether or not there is a loss of consciousness or awareness.
• Generalized seizures can be further broken down into absence, tonic, atonic, clonic, myoclonic, and tonic-clonic seizures.
• Unknown-onset seizures are seizures where the start is not observed or known. These seizures may later be diagnosed as focal or generalized.

Learn more about seizure types and symptoms.

Find Your Team

On MyEpilepsyTeam, the social network for people with epilepsy and their loved ones, more than 122,000 members come together to ask questions, give advice, and share their stories with others who understand life with epilepsy.

What questions do you have about epilepsy? What advice or insights can you share with people who are newly diagnosed? Share your experience in the comments below, or start a conversation by posting on your Activities page.