Síntomas de convulsiones: Señales antes y después

What Is a Seizure?

A seizure is a temporary disruption in normal brain activity caused by a burst of abnormal electrical signaling. Depending on where that activity starts and how far it spreads, a seizure may affect movement, awareness, memory, emotions, behavior, or the senses.

Some seizures involve stiffening and rhythmic jerking. Others are so subtle that they resemble daydreaming, clumsiness, or a brief moment of confusion. The brain, as it turns out, has more than one way to announce that something unusual is happening.

Having one seizure does not automatically mean a person has epilepsy. Seizures can occur in connection with fever, head injury, stroke, infection, blood sugar abnormalities, medication reactions, alcohol or drug withdrawal, and other medical problems. Epilepsy generally refers to an ongoing tendency to have recurrent, unprovoked seizures.

Medical basis:

Seizure Phases: Before, During, and After

Health professionals may describe a seizure in several phases. Not every person experiences every phase, and the boundaries can be blurry.

• Prodrome: Changes that may develop hours or occasionally days before a seizure.
• Aura: The earliest part of certain focal seizures, sometimes experienced as a warning.
• Ictal phase: The active seizure itself.
• Postictal phase: The recovery period after the seizure ends.

An aura is not merely nervous anticipation. In medical terms, it can be a focal aware seizure that remains limited or progresses into a seizure affecting awareness or both sides of the brain.

Medical basis:

Possible Signs Before a Seizure

Some people receive no warning at all. For others, a familiar sensation appears before nearly every episode. These warning symptoms may last seconds, minutes, orin the case of a prodromeconsiderably longer.

Mood and Behavior Changes

Possible changes before a seizure include irritability, anxiety, restlessness, emotional sensitivity, low mood, difficulty concentrating, or an unexplained sense that something is wrong. These symptoms are nonspecific, meaning they can occur for countless reasons. Their importance increases when they repeatedly appear in the same pattern before a documented seizure.

Unusual Sensory Experiences

A focal seizure may produce sensations that seem oddly specific, including:

• A smell that no one else notices, such as smoke or burning rubber
• A metallic, bitter, or otherwise unusual taste
• Flashing lights, blurred vision, or visual distortion
• Buzzing, ringing, muffled sound, or auditory distortion
• Tingling, numbness, warmth, or an electrical sensation
• A rising feeling in the stomach

Déjà Vu, Fear, or a Dreamlike Feeling

A person may experience intense déjà vu, sudden fear, euphoria, a sense of impending doom, or the impression that familiar surroundings are strangely unfamiliar. Some describe feeling detached from their body or as though the world has briefly become unreal.

These experiences are sometimes dismissed as panic or imagination. However, repeated, brief, highly similar episodesespecially when followed by altered awarenessdeserve medical attention.

Physical Warning Signs

Other possible signs include dizziness, nausea, headache, sweating, pallor, rapid heartbeat, muscle twitching, difficulty speaking, or unusual movements in one hand, arm, leg, or side of the face.

No single warning symptom confirms a seizure. Migraine, fainting, panic attacks, low blood sugar, sleep disorders, medication effects, and heart rhythm problems can produce overlapping symptoms. Accurate diagnosis requires a clinician to consider the full sequence of events.

Medical basis:

Symptoms During a Seizure

Seizure symptoms depend largely on whether abnormal activity begins in one area of the brain or appears to involve both sides from the start.

Focal Aware Seizure Symptoms

During a focal aware seizure, the person remains conscious and may remember the event. Symptoms can include:

• Jerking or stiffening of one body part
• Tingling, pain, heat, or numbness
• Unusual smells, tastes, sounds, or visual effects
• Sudden fear, joy, nausea, or déjà vu
• Difficulty speaking despite understanding others

The episode may last only seconds. Because the person remains awake, these seizures are frequently mistaken for stress, muscle spasms, or “one of those weird moments.”

Focal Impaired Awareness Seizure Symptoms

A person experiencing a focal impaired awareness seizure may look awake but cannot interact normally. Common signs include:

• A blank, confused, or dazed expression
• Failure to answer questions or follow instructions
• Lip smacking, chewing, swallowing, or picking at clothing
• Rubbing the hands or repeating purposeless movements
• Wandering or trying to undress
• Speech that does not make sense

These automatic behaviors are called automatisms. The person is not deliberately ignoring anyone or behaving strangely for dramatic effect. Their awareness is temporarily impaired.

Generalized Tonic-Clonic Seizure Symptoms

This is the type most people picture when they hear the word “seizure.” The person may suddenly lose consciousness and fall. The body often stiffens during the tonic phase, followed by rhythmic jerking during the clonic phase.

Additional signs can include a cry or groan, irregular breathing, drooling, jaw clenching, tongue or cheek biting, and loss of bladder control. The skin around the lips may temporarily look blue or gray because breathing can become irregular.

The movements usually slow and stop on their own. Although watching the clock may feel nearly impossible in the moment, timing the seizure is one of the most useful things a bystander can do.

Absence Seizure Symptoms

An absence seizure may cause a sudden blank stare lasting only a few seconds. The person may stop speaking in the middle of a sentence, blink rapidly, make small chewing movements, and then continue the previous activity with little or no awareness that anything happened.

In children, frequent absence seizures may initially look like inattention. A child who appears to miss tiny pieces of conversations throughout the day may not simply be perfecting the art of selective listening.

Atonic and Myoclonic Seizures

An atonic seizure causes a sudden loss of muscle tone. The person’s head may drop, the knees may buckle, or the entire body may collapse. Myoclonic seizures cause very brief, shock-like muscle jerks, sometimes occurring in clusters. A person may suddenly throw an object they were holding without intending to do so.

Medical basis:

Symptoms After a Seizure

The postictal period begins when active seizure activity ends. Recovery can be immediate after some brief seizures, while other episodes are followed by minutes or hours of symptoms.

Confusion and Memory Loss

The person may not know where they are, what day it is, or what just happened. They may repeat questions or have no memory of the episode. Speaking slowly, reducing noise, and using simple explanations can make recovery less frightening.

Fatigue and Sleepiness

Intense fatigue is common after a tonic-clonic or focal impaired awareness seizure. Some people sleep for several hours. Rest may be appropriate once breathing is normal and no emergency warning signs are present.

Headache and Muscle Pain

A post-seizure headache can range from mild pressure to migraine-like pain. Muscle soreness may feel similar to the aftermath of an unusually aggressive workoutexcept no one signed up for the gym membership. Injuries from falling, tongue biting, or striking nearby objects may also cause pain.

Speech, Vision, and Coordination Problems

Some people temporarily struggle to speak, understand language, see clearly, walk steadily, or perform familiar tasks. These symptoms should gradually improve. New or persistent neurological problems require urgent medical evaluation because stroke and other emergencies can sometimes resemble or cause seizures.

Temporary Weakness

Todd paralysis is temporary weakness or paralysis affecting part of the body after a seizure. It may last from minutes to hours. Because one-sided weakness is also a classic stroke warning sign, emergency assessment is often necessaryparticularly after a first episode or when the cause is unknown.

Emotional Changes

A person may feel anxious, embarrassed, sad, irritable, frightened, or unusually emotional after a seizure. Calm reassurance matters. Avoid surrounding the person with a committee of curious onlookers asking, “Do you remember me?” every seven seconds.

Medical basis:

What to Do When Someone Has a Seizure

Protect the Person From Injury

1. Stay calm and note the time the seizure begins.
2. Help the person to the ground if they are falling.
3. Move furniture, glass, tools, and other hard or sharp objects away.
4. Place something soft and flat beneath the head.
5. Remove eyeglasses and loosen tight clothing around the neck.
6. Turn the person gently onto one side when it is safe to do so.
7. Stay nearby until the person is awake, oriented, and breathing normally.

What Not to Do

• Do not restrain the person. Holding the arms or legs does not stop a seizure and can cause injury.
• Do not put anything in the mouth. A person cannot swallow their tongue. Objects can break teeth, block the airway, or cause choking.
• Do not offer food, water, or pills until the person is fully awake and able to swallow safely.
• Do not perform CPR during active convulsions. After movements stop, check breathing. Begin CPR only if the person is not breathing and you are trained to provide it.

Medical basis:

When to Call 911

Call 911 or the local emergency number when:

• The seizure lasts longer than five minutes.
• Another seizure begins before the person fully recovers.
• The person has trouble breathing or does not wake as expected.
• The seizure occurs in water.
• The person is seriously injured.
• It is the person’s first known seizure.
• The person is pregnant.
• The person has diabetes and loses consciousness.
• The episode is significantly different from the person’s usual seizures.

Seizure activity lasting five minutes or repeated seizures without recovery may represent status epilepticus, a life-threatening emergency requiring immediate treatment.

Medical basis:

How Doctors Evaluate Seizure Symptoms

A medical evaluation may include a neurological examination, blood tests, an electroencephalogram, and brain imaging such as MRI or CT. Doctors may investigate infection, stroke, head trauma, medication effects, substance withdrawal, metabolic abnormalities, or structural changes in the brain.

A witness description can be extremely valuable because the person having the seizure may not remember it. Useful details include:

• What happened immediately before the episode
• Whether the person responded when spoken to
• Which body part moved first
• Whether the eyes or head turned to one side
• Changes in breathing or skin color
• The duration of stiffening, jerking, and confusion
• How long it took to return to normal

A safely recorded phone video may also help a neurologist distinguish seizures from fainting, movement disorders, sleep events, migraine, or nonepileptic episodes. Recording should never take priority over protecting the person or calling emergency services.

Medical basis:

Experiences Related to Seizure Symptoms Before and After an Episode

The following scenarios are educational composites rather than accounts of identifiable patients. They illustrate how seizure symptoms may be experienced and why patterns matter.

Experience 1: The “Strange Stomach Feeling”

Imagine a person who occasionally feels a sudden rising sensation in the stomach, followed by intense déjà vu. The room looks normal, but it somehow feels like a scene already lived through. For approximately 20 seconds, the person cannot speak even though they understand a family member’s question.

The sensation disappears, and daily life resumes. Because there is no collapse or shaking, the episodes are initially blamed on anxiety. Several months later, one progresses to a period of staring, lip smacking, and confusion. A witness notes that the person cannot respond for about one minute and remains tired afterward.

This sequence demonstrates why a stereotyped aura can matter. Brief, repeated experiences involving the senses, emotions, stomach, or memory can represent focal seizure activity, especially when each episode follows nearly the same script.

Experience 2: Confusion After Full-Body Shaking

In another scenario, a person suddenly becomes rigid, falls, and develops rhythmic jerking. A bystander moves a chair away, cushions the head, starts a timer, and resists the outdated urge to place something in the mouth. The movements stop after roughly 90 seconds.

The person begins breathing more regularly but appears deeply asleep. Upon waking, they are frightened and repeatedly ask why everyone is standing nearby. They have a headache, sore muscles, and no memory of falling. Their cheek is painful from being bitten.

These postictal symptoms can be expected after a tonic-clonic seizure, but observation remains important. Difficulty breathing, prolonged unresponsiveness, serious injury, or another seizure would require emergency help. Because this was a first-known seizure, medical evaluation is also necessary even though the convulsions ended on their own.

Experience 3: A Child Who Appears to Daydream

A teacher notices that a student occasionally stops mid-sentence and stares for several seconds. The child’s eyelids flutter, and then the conversation continues as though nothing happened. Calling the child’s name during the pause produces no response.

At first, the episodes look like ordinary distraction. However, they occur repeatedly throughout the day and begin abruptly. The teacher records the timing and describes the behavior to the child’s caregiver, leading to a medical assessment.

This experience highlights the subtle nature of absence seizures. There may be no fall, confusion, or lengthy recovery. The clue is the sudden interruption of awareness and the consistent, brief pattern.

Experience 4: The Emotional Aftermath

Physical recovery is only part of the experience. A person may wake after a seizure surrounded by worried relatives, emergency responders, or coworkers. They may feel exposed, embarrassed, guilty, or afraid that another episode will happen without warning.

Supportive responses can reduce distress. A calm statement such as, “You had a seizure, you are safe, and I am staying with you,” is more helpful than rapid-fire questions. Allowing privacy, explaining what happened without judgment, and helping the person contact someone they trust can make the recovery period less overwhelming.

Keeping a seizure diary may also restore a sense of control. Notes about sleep, illness, missed medication, alcohol use, stress, menstrual cycles, warning sensations, duration, and recovery can help a clinician identify patterns. The goal is not to turn every headache or bad mood into a medical mystery. It is to document repeatable details that may improve diagnosis and treatment.

Conclusion

Seizure symptoms vary far more than popular portrayals suggest. Warning signs may include déjà vu, unusual smells, stomach sensations, fear, visual changes, or brief muscle movements. During a seizure, a person may stare, become unresponsive, repeat automatic behaviors, stiffen, jerk, or suddenly lose muscle tone. Afterward, confusion, fatigue, headache, soreness, memory problems, and emotional distress may occur.

Recognizing the complete sequencebefore, during, and afterhelps witnesses provide better information and safer first aid. Protect the person from injury, time the episode, never restrain them, and never place an object in their mouth. Seek emergency assistance when a seizure lasts longer than five minutes, repeats without recovery, causes breathing difficulty or injury, occurs in water, or represents a first-known episode.

Medical note: This article is for educational purposes and does not diagnose or treat any condition. New, unexplained, or changing seizure-like symptoms should be evaluated by a qualified health professional. The information was synthesized from guidance published by the CDC, NIH/NINDS, MedlinePlus, Epilepsy Foundation, Mayo Clinic, Cleveland Clinic, Johns Hopkins Medicine, Penn Medicine, Mount Sinai, Stanford Health Care, Cedars-Sinai, American Red Cross, Children’s Hospital of Philadelphia, and Boston Children’s Hospital.

Source synthesis:
Source synthesis:
Source synthesis: