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Difference Between Seizure and Tremor

What is Seizure and Tremor?

Both seizures and tremors are medical conditions that involve involuntary shaking in either one part or multiple parts of the body. Tremors are one of the symptoms of seizures. 


Seizures are a medical condition that are indicative of an underlying neurological problem, which may be a brief or long-term issue. Seizures happen because of an abnormal upsurge of electrical activity in the brain, due to chemical changes in nerve cells. 


Tremor is an uncontrolled and involuntarily movements that cause shaking in one or multiple parts of the body. Tremors affect mostly hands but can also happen in the legs, torso, head, arms and vocal cords. 

Difference between Seizure and Tremor



It is a neurological medical condition which happens when there is a sudden and uncontrolled electrical disturbance in the brain.


Involuntary and uncontrollable rhythmic movement of one part of the body or one limb of your body. 



Seizures are of following types;

  • Absence seizures – Also called Petit Mal seizure. It is the sudden, brief lapses of consciousness. Affect most children of 5-9 years old.
  • Tonic-clonic – Also termed as Grand Mal Seizure. It is defined as a loss of attention and consciousness and extremely violent muscle contractions.
  • Atonic seizures- These are also termed as akinetic seizures. These cause sudden and abrupt loss of muscle strength.
  • Clonic seizures – It means sustained rhythmical jerking rhymical. It involves jerking movements triggered by the repeated stiffening and relaxing of muscles 
  • Myoclonic seizures – It is defined as a short-lived shock-like jerks of a muscle or group of muscles. 


Tremors are of following types;

  • Resting tremor – It happens when the muscle is relaxed, for example when the hands are resting on the lap
  • Postural tremor – It happens when an individual is holding a position against gravity, for example arm or leg outstretched
  • Action or kinetic tremor – It happens at the time of voluntary movement
  • Intention tremor – It is a dyskinetic disorder which involves purposeful and voluntary movement towards a target, for example lifting hand to write.
  • Task specific tremor – This type of tremor emerges during a particular activity
  • Nystagmus Tremor – This tremor is used to describe unintentional repetitive eye movements that make it impossible for a person to keep their eyes fixed on any given object



  • Temporary confusion
  • Changes in behaviour
  • A staring spell
  • Extreme tiredness after a seizure 
  • Strange sensations and emotions
  • Involuntary urination
  • Aura
  • Uncontrollable jerk like movements of the legs and arms 
  • Frothing from the mouth
  • Loss of consciousness or awareness
  • Tongue biting
  • Emotional or cognitive symptoms, such as déjà vu, fear, or anxiety 
  • Sudden falling
  • Tasting a bitter or metallic flavour
  • Teeth clenching


  • Shaky and Quavering voice
  • Uncontrollable nodding head
  • Tingling or numbness in any part of the body
  • Tremors triggered due to emotional anxiety
  • Uncontrollable shaking occurring intermittently for brief periods of time
  • Nodding head
  • Balance problems (in rare cases)
  • Protruding eyes
  • Unexplained weight loss
  • Perspiration
  • Goitre
  • Stooped posture

Life-threatening symptoms of tremors include;

  • Nonreactivity to light or pupil size that is abnormal pupil size
  • Loss of consciousness or confusion for a short period of time
  • Breathing with difficulty 
  • Head Stammering (speaking difficulty or difficulty in understanding speech)
  • Paralytic attack
  • Changes in vision or loss of vision
  • Nystagmus (involuntary rolling of the eyes)
  • Rigid trunk
  • Slurred speech
  • Loss of strength (Weakness)



The most common causes of seizure are;

  • Epilepsy
  • Any type of brain injury (like stroke, trauma, stroke, brain infection, or a brain tumor)
  • Drug abuse
  • High fever, usually associated with an infection for example – meningitis 
  • Electric shock
  • Congenital brain defects (Brain problems that occur before birth)
  • Inadequate sleep
  • Low blood sodium (hyponatremia), which can happen with diuretic therapy
  • Illegal or recreational drugs, like amphetamines or cocaine


The most common causes of tremors are:

  • Muscle fatigue
  • Prescription drugs
  • Injuries
  • Deficiencies of magnesium and thiamine 
  • Ingesting too much caffeine
  • Lack of sleep
  • Lack of vitamins
  • Increased stress
  • Stress
  • Aging
  • Low blood sugar levels

Neurological disorders or health conditions that can result in tremors include:

  • Brain injury that is traumatic
  • Low blood sugar (hypoglycemia)
  • Stroke
  • Wilson’s disease
  • Chronic kidney disease
  • Multiple sclerosis (the immune systems attacks spinal cord and brain)
  • Parkinson’s disease (a neurodegenerative disease caused by loss of dopamine-producing brain cells)
  • Alcoholism
  • Hyperthyroidism (the body release nigh amounts of thyroid hormone)
  • Neurodegenerative diseases that destroy parts of the brainstem or the cerebellum

Some other causes of tremors include use of drugs and medications (Amphetamines, caffeine, cocaine, corticosteroids, SSRIs) or alcohol, mercury poisoning, or the withdrawal of drugs such as benzodiazepine or alcohol.



Medications – Carbamazepine, Phenytoin, Valproic acid, Oxcarbazepine, Lamotrigine, Gabapentin, Topiramate, Phenobarbital.

Surgery – Surgery is meant to prevent seizures that always originate in the same place in the brains.

Vagus nerve stimulation (VNS) – It is a medical treatment that involves delivering electric impulses using an instrument that is implanted beneath the chest skin that facilitates the stimulation of the vagus nerve in the neck, triggering signals to the brain that inhibit seizures.

Responsive neurostimulation – an instrument is implanted in this treatment on the surface of the brain tissue to detect seizure and with the help of electrical stimulation prevent the seizure

Deep brain stimulation– In this, the electrodes are implanted in different areas of the brain to provide stimulation directly to the brain to help prevent the spread of seizures 

Dietary therapy – Low carb diet called keto diet is helpful in preventing seizures.  


Medications (Betablockers and anticonvulsant) – Gabapentin (Neurontin), primidone (Mysoline), propranolol (Hemangeol, Inderal, Inderal XL, and InnoPran XL) and topiramate (Topamax).

OnabotulinumtoxinA (Botox) injections– These injections are helpful in treating voice and head tremors.

Tranquilizers – Benzodiazepine drugs such as clonazepam (Klonopin) 

Surgery – Only considered in extreme cases, where symptoms are not getting controlled by other forms of treatment. Surgery involves thalamotomy (operating on) or the brain stimulation (electrical stimulation of an area of the brain called the thalamus). 


The points of difference between Seizure and Tremor have been summarized as below:

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References :

[0]Deykin, E. Y., & MacMahon, B. (1979). The incidence of seizures among children with autistic symptoms. The American journal of psychiatry.

[1]Findley, L. J. (1996). Classification of tremors. Journal of clinical neurophysiology, 13(2), 122-132.

[2]Puschmann, A., & Wszolek, Z. K. (2011, February). Diagnosis and treatment of common forms of tremor. In Seminars in neurology (Vol. 31, No. 01, pp. 065-077). © Thieme Medical Publishers.

[3]Stafstrom, C. E., & Carmant, L. (2015). Seizures and epilepsy: an overview for neuroscientists. Cold Spring Harbor perspectives in medicine, 5(6), a022426.

[4]Image credit: https://commons.wikimedia.org/wiki/File:Side_effects_of_Tramadol.png

[5]Image credit: https://commons.wikimedia.org/wiki/File:Depiction_of_neural_activity_during_a_seizure.gif

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