Seizures are caused by disruptions in the electrical impulses of the nerve cells of the brain (neurons). Seizures can cause symptoms that impact your muscles, senses, behavior, emotions, or awareness.
Seizures symptoms vary depending on the type:
- Generalized seizures: Disruptions occur on both sides of the brain.
- Partial seizures: Disruptions appear only on one side of the brain.
(Produced by the entire brain)
|1. "Grand Mal" or Generalized tonic-clonic||Unconsciousness, convulsions, muscle rigidity|
|2. Absence||Brief loss of consciousness|
|3. Myoclonic||Sporadic (isolated), jerking movements|
|4. Clonic||Repetitive, jerking movements|
|5. Tonic||Muscle stiffness, rigidity|
|6. Atonic||Loss of muscle tone|
(produced by a small area of the brain)
Simple (awareness is retained)
(Impairment of awareness)
|Automatisms such as lip smacking, chewing, fidgeting, walking, and other repetitive, involuntary but coordinated movements|
|3. Partial seizure with secondary generalization||Symptoms that are initially associated with a preservation of consciousness then evolves into a loss of consciousness and convulsions.|
Why do seizures happen?
A seizure occurs when there is an abnormal burst of electrical activity in the brain that usually lasts a few seconds to minutes.
There are millions of nerve cells in the brain (neurons). Nerve cells usually transmit small electrical impulses along the nervous system to all regions of the body. Different sections of the brain control distinct organs and functions of the body. The interaction between neurons in a normal brain is orderly and balanced. However, when numerous neurons misfire at the same time, it can produce abrupt changes in a person's feelings, behaviors, and/or awareness.
Symptoms that occur during a seizure are determined by the location of the unexpected burst of electrical activity, and the strength of these electrical interruptions determines the severity of the disorder.
What conditions cause seizures?
Seizures are often an indication of a more serious condition and can be caused by the following:
- Mental health issues (caused by bleeding, head injury, or infection)
- Sudden drops in blood sodium levels (usually associated with drinking unusually large amounts of water in a short period of time)
- Fluctuation of blood sugar levels (either too low or too high)
- Brain tumors (relatively rare)
- Pregnancy complications
- Toxin accumulation (kidney failure, liver dysfunction)
- Alcohol or drug use or withdrawal
What are generalized seizures?
Seizures with generalized onset do not begin in one section of the brain but are caused by simultaneous abnormal nerve discharge spikes in the cortex. They can be hereditary although they are often due to sleep deprivation or excessive alcohol intake.
Generalized tonic-clonic or grand mal seizures
- The tonic phase of the seizure begins with the person crying out or groaning as if the air is being driven out of the lungs, then stiffens and collapses unconscious on the ground.
- During the clonic phase, the person's limbs begin to twitch. The jerking diminishes and eventually ceases after a few minutes.
- One seizure episode may last 1-3 minutes, after which the person may feel lethargic, disoriented, irritated, and sleepy.
- Emergency medical treatment is required if the tonic-clonic seizure lasts more than 5 minutes.
Absence or petit mal seizures
- These types of seizures are common among children and are characterized by a lack of symptoms and may resemble staring episodes.
- There are two types:
- Typical absences: These usually last for a few seconds and may go unnoticed because of the short duration. The person becomes blank and unresponsive and appears to be daydreaming. They may stare aimlessly or flicker their eyelids, becoming unaware of their surroundings and what they are doing.
- Atypical absences: Characteristics of this type of seizure are the same as typical absences, but they begin and end more slowly and continue slightly longer. Some people may fall because symptoms may involve a shift in muscular tone. The limbs become limp or floppy.
- Myoclonic seizures are characterized by sporadic (isolated) jerky movements, during which the person is aware of what is happening.
- They are brief but can occur in clusters (several occurring at the same time), usually immediately after waking.
- These are classified as generalized seizures because of the possibility of additional seizures (such as tonic-clonic seizures).
- Clonic seizures are characterized by a repetitive, rapid stiffening and relaxing of muscles. Restraining the arms or legs will not stop the movements.
- They are uncommon and usually occur in infants.
- Clonic movements are most noticed as part of a tonic-clonic seizure.
- Like a clonic seizure, jerking movements can persist from a few seconds to a minute. Jerking or clonic movements that occur after muscular stiffness can last seconds to 1-2 minutes.
- They can be difficult to distinguish from a myoclonic seizure, but the jerking is more regular and persistent.
- With tonic seizures, the muscle tone of the torso, arms, or legs suddenly gets rigid or tight.
- The person may be alert or have only slightly altered awareness.
- This type of seizure often occurs during sleep and involves all or a part of the brain, affecting both sides of the body.
- They are usually less than 20 seconds long.
- With atonic seizures, the muscles get stiff, the person's eyes may droop, and their head may nod or drop forward. The body may go limp.
- This type of seizure may cause a fall if the person was standing during the seizure.
- These convulsions usually last no more than 15 seconds.
- Scans Show Brain Changes in People With Long COVID
- Got GERD? Eat This Way to Help Avoid Symptoms
- 5 Women Contracted Syphilis Affecting the Eyes From the Same Asymptomatic Man
- Long COVID Now Common in U.S. Nursing Homes
- Breathing in Coal-Based Pollution Could Be Especially Deadly: Study
- More Health News »
What are partial seizures?
Meningitis, stroke, developmental impairment, and physical brain injury are all potential causes of focal seizures. Symptoms of a focal seizure begin in one section of the brain and can extend to other parts of the brain. Thus, symptoms may occur gradually. They could be preceded by an aura, which some individuals perceive as a foreshadowing of a seizure but is the outcome of minor seizure symptoms.
Generally, as the seizure progresses, the person begins to exhibit additional symptoms, such as:
- Muscular rigidity
- Chewing movements
- Disoriented or puzzled
The various types of focal seizures include
Simple partial seizures
- Caused by epileptic activity that is restricted to one area of the brain, generally the cortex or limbic system.
- Consciousness is unaffected; the person can converse, respond to questions, and recall what happened during the seizure.
- Manifest differently in everyone.
- Are divided into subcategories based on the symptoms.
Autonomic seizures or abdominal epilepsy
- Characterized by autonomic symptoms, such as abdominal discomfort or nausea, which may rise into the throat to produce stomach pain, borborygmi (rumbling noises of gas moving in the intestines), belching, farting, and vomiting.
- Pallor, flushing, sweating, hair standing on end (piloerection), pupil dilation, heart rate, and breathing changes, and urination are possible signs.
- Sexual arousal, penile erection, and orgasm may occur in a few people.
Emotional simple partial seizures
- Also called temporal lobe auras or simple partial seizures of temporal lobe origin.
- Frequently manifest as an unusual experience, causing the person to see or hear things that are not present.
- May cause fear, sadness, rage, or joy.
- May cause the person to experience a terrible odor or flavor, a weird feeling in the stomach, or a choking sensation.
- Also called Jacksonian motor seizures; the spread is referred to as a Jacksonian march and is unstoppable.
- Convulsive movements could be clonic or jerking.
- Jerking usually starts in one region of the body, such as the face, arm, leg, or trunk, and may progress to other sections.
- Also called Jacksonian sensory seizures and are accompanied by a sensory experience.
- The individual may see lights, hear a buzzing sound, or experience tingling or numbness in a specific area of the body.
Complex partial seizure
- When epileptic activity extends to both temporal lobes of the brain, a complex partial seizure follows. A complicated partial seizure frequently follows a simple temporal lobe partial seizure.
- Does not cause convulsions but compromises consciousness.
- Usually starts with a blank or empty stare. After the seizure begins, the person can no longer answer.
- The person may look confused and becomes ignorant of their surroundings.
- May escalate to chewing movements, uncoordinated activities, or meaningless behaviors that look random and awkward. These automatisms may involve activities, such as:
- Picking at their clothes
- Attempting to remove their clothes
- Mindlessly strolling about
- Picking up objects
- The person may not have any recall of the seizure after it has occurred.
- A complex partial seizure often lasts between 2-4 minutes. It may be followed by a prolonged period of perplexity.
- Once a seizure pattern is formed, it is frequently repeated with each successive episode.
- Anticonvulsant medicine is occasionally ineffective.
Partial seizure with a secondary generalization
- Starts as a partial seizure and progresses to a generalized convulsive (grand mal) seizure.
- Most people with partial seizures have simple partial, complicated partial, or secondary generalized seizures.
- Medication can manage seizures in about two-thirds of people with partial epilepsy.
- Frequently treated surgically when medications do not work.
Health Solutions From Our Sponsors
MOTOR SEIZURE. https://www.epilepsydiagnosis.org/seizure/motor-overview.html
Types of Epileptic Seizures. https://www.barrowneuro.org/resource/types-of-epileptic-seizures-2
Top Seizures Symptoms and Types Related Articles
CT Scan vs. MRI
CT scan (computerized tomography) is a procedure that uses X-rays to scan and take images of cross-sections of parts of the body. CT scan can help diagnose broken bones, tumors or lesions in areas of the body, blood clots in the brain, legs, and lung, and lung infections or diseases like pneumonia or emphysema.
MRI (magnetic resonance imaging) is a procedure that uses strong magnetic fields and radiofrequency energy to make images of parts of the body, particularly, the organs and soft tissues like tendons and cartilage.
Both CT and MRI are painless, however, MRI can be more bothersome to some individuals who are claustrophobic, or suffer from anxiety or panic disorders due to the enclosed space and noise, the machine makes.
MRI costs more than CT, while CT is a quicker and more comfortable test for the patient.
What Is the Difference Between a Seizure and a Convulsion?Learn what the main difference between a seizure and a convulsion is, and how to recognize and treat either condition.
Seizures QuizDo you know the difference between seizures and epilepsy? What are the types of seizures? Take the Epilepsy & Seizures Quiz to test your knowledge and learn about this complex disorder of the brain.
Epilepsy SlideshowLearn about epilepsy symptoms and treatment for this seizure condition. Discover the definition of epilepsy, how epilepsy is diagnosed, epilepsy medications, and how epilepsy dogs help people with seizures.
What Is the First Aid for Seizures?Some seizures are caused by brain diseases, tumors, genetic conditions, or other illnesses or disorders that can be diagnosed (symptomatic seizures). When the cause for the seizures is unknown, they are referred to as idiopathic or cryptogenic seizures. If a person has a seizure, loosen the clothing around his/her neck and remove sharp objects around the person to prevent injury. After the seizure, lay the person on his/her side to maintain an open airway. If the seizure lasts more than five minutes or if the person cannot be awakened after the seizure, call 911. Learn common seizure triggers, including foods or medications, hormones, stress, lack of sleep, dehydration, or sensitivity to light.
Migraines and SeizuresMigraines are a type of headache and seizures are the main symptom of epilepsy. Migraine headaches and seizures are two different neurological problems that have similar signs, symptoms, and auras, for example, sensitivity to light (photophobia) and sound, irritability, nausea, and vomiting.
Symptoms unique to migraine and migraine auras are water retention, problems sleeping, appetite changes, and talkativeness. Symptoms unique to seizure and seizures auras are depression, a feeling of heaviness, a feeling that a seizure is approaching, and depression.
Many of the symptoms of migraine and seizures are the same, however, seizures do not cause migraines; however, people who have seizures are twice as likely to have migraines and vice-versa. People who have migraines are twice as likely to have seizures, and people with seizures are twice as likely to have migraines; however, one condition does not cause the other.
What are the Risks and Complications of an Amygdalohippocampectomy?An amygdalohippocampectomy is a surgical operation to remove a portion of the brain as a treatment for temporal lobe epilepsy. The procedure involves the selective removal of certain portions of the brain’s temporal lobe. The temporal lobes are located beneath the temples on either side of the head.
Temporal Lobe ResectionThe largest part of the brain, the cerebrum, is divided into four paired sections—the frontal, parietal, occipital, and temporal lobes. Each lobe controls a specific group of activities. The temporal lobe, located on either side of the brain just above the ear, plays an important role in hearing, language, and memory. In people with temporal lobe epilepsy, the area where the seizures start -- called the seizure focus -- is located within the temporal lobe.
What Are the Symptoms of Nervous System Cancer?Nervous system or central nervous system (CNS) cancer can cause a wide range of signs and symptoms, which can vary. These symptoms include headaches, seizures, changes in mental function, vision problems, weakness or numbness, difficulty speaking, changes in behavior or personality, balance problems, pain, nausea and vomiting, changes in vision or hearing, swelling in the face or neck, and loss of appetite.
What Does a CT Head Scan Show?A computerized axial tomography (CAT) or computerized tomography (CT) scan uses a series of X-rays taken at different angles to produce a detailed image of the head and brain. A CT scan is done to study the patient’s skull, brain, jaw, sinuses, and facial bones, and to investigate tumors, head injuries, aneurysms, and other conditions.
What Is a Cluster Seizure?Cluster seizures are episodes of increased seizure activity in which two or more seizures occur in 24 hours. Multiple seizures occur one after the other typically with a recovery period between each seizure and are different from a person’s usual seizure pattern.
What Is the Life Expectancy of Someone With Coffin-Siris Syndrome?Coffin-Siris syndrome (CSS) is a rare hereditary condition noticeable from birth (congenital). Most people with Coffin-Siris syndrome (CSS) live relatively long lives. The lifespan of affected individuals varies widely depending on the person’s level of physical and mental development and the severity of the illness. Medical care increases the quality of life and lifetime of people with CSS.