Generalized Tonic-Clonic Seizure: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Generalized Tonic-Clonic Seizure?
A neurologist, a doctor who treats brain and nerve conditions, usually diagnoses and treats generalized tonic-clonic seizures. In an emergency, call 911. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is a generalized tonic-clonic seizure?
A generalized tonic-clonic seizure is a type of seizure that involves the entire body. It is also called a grand mal seizure.
Seizures come from abnormal electrical activity in the brain. Generalized seizures are a result of abnormal activity on both sides of the brain. Tonic-clonic seizures cause stiffening of the body, repeated jerks of the arms or legs, and loss of consciousness.
Symptoms
Many people have an aura, a warning feeling, before the seizure. It can include:
- Changes in vision, taste, smell, or other senses.
- Seeing, smelling, or sometimes hearing things that are not there.
During the seizure, the muscles first become rigid. This is the tonic phase. Then strong, violent muscle contractions follow. This is the clonic phase.
Other symptoms during the seizure may include:
- Biting the cheek or tongue.
- Loss of urine or stool control.
- Stopped breathing or trouble breathing.
- Blue skin color.
After the seizure, the person may have:
- Drowsiness or sleepiness for 1 hour or longer, called the post-ictal state (the recovery period).
- Memory loss about the seizure.
- Weakness on one side of the body for a few minutes to a few hours, called Todd paralysis.
Causes and who gets it
Seizures result from electrical overactivity in the brain. This abnormal electrical activity can run in families. It can also result from a brain injury at birth or later in life.
They can happen once, or as part of epilepsy, a long-term illness with repeated seizures. Seizures can have many causes. These include high fever, head injury, brain infection, and withdrawal from alcohol or certain medicines.
Some medical problems can provoke a seizure, including:
- Low or very high blood sugar.
- Changes in the blood levels of sodium, calcium, or magnesium.
- Poor kidney or liver function.
Seizure triggers do not cause epilepsy, but they can provoke seizures in people who are susceptible. Triggers include:
- Stress.
- Drinking alcohol, or alcohol withdrawal.
- Dehydration or missing meals.
- Sleep deprivation.
How doctors diagnose it
A provider does a physical exam, including a detailed check of brain and nerve function.
- An electroencephalogram (EEG) checks the electrical activity in the brain. The brain's electrical activity may look normal after a seizure or between seizures.
- A head CT or MRI scan may be done to find the cause and location of the problem in the brain.
Treatment
Treatment can include medicines, lifestyle changes, and sometimes surgery.
Epilepsy is most often treated with antiseizure medicines. Most seizures can be controlled with one drug. It may take several months to find the best drug and dose.
Some medicines are harmful to a fetus, so women who plan to get pregnant should talk with their doctor.
Stopping seizure medicine should always be done with a doctor's supervision, so follow your doctor's instructions. Stopping too early is one of the major reasons people who have been seizure-free start having new seizures. It can lead to status epilepticus, which is potentially life threatening.
Some people do not respond to medicines or cannot take them. They may be candidates for surgery, dietary changes, or devices to stop their seizures. Vagus nerve stimulation uses a device implanted under the skin of the chest. Surgery has risks.
When to see a doctor
Tell your doctor about any seizure. Accurate diagnosis is crucial for finding effective treatment.
Call 911 right away if this is the first time the person has had a seizure, or if a seizure lasts more than 5 minutes. Also call if the person does not wake up or act normally afterward, or if another seizure starts soon after one ends. Call 911 too if the seizure happened in water, or the person is pregnant, hurt, has diabetes, or has trouble breathing after the seizure ends.
During a seizure, lay the person on the ground and cushion the head. Turn the person on their side. Do not hold them down. Do not put anything in their mouth. Stay until they recover or help arrives.
Weakness on one side after a seizure can resemble a stroke. A stroke requires immediate attention from a doctor. If you are not sure, call 911.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. A direct primary care doctor can review your seizure history and your medicines. They can also help you follow up with a neurologist.
Common questions
Is a grand mal seizure the same as a generalized tonic-clonic seizure?
Yes, grand mal seizure is another name for this type of seizure. It is also called a bilateral tonic-clonic seizure.
Does one seizure mean a person has epilepsy?
Not necessarily. A tonic-clonic seizure can happen once. Doctors generally diagnose epilepsy after two or more unprovoked seizures, with at least 24 hours between them.
How long does a tonic-clonic seizure last?
A seizure often stops after a few seconds or minutes. Most stop by themselves, but a person can be hurt during one. Call 911 if a seizure lasts more than 5 minutes.
Can a person stop taking seizure medicine once they feel better?
No, not on their own. Stopping should always be done with a health care professional's supervision.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
