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Partial (focal) seizure

All seizures are caused by abnormal electrical disturbances in the brain. Partial (focal) seizures occur when this electrical activity remains in a limited area of the brain. The seizures can sometimes turn into generalized seizures, which affect the whole brain. This is called secondary generalization.

Partial seizures can be divided into:

  • Simple, not affecting awareness or memory
  • Complex, affecting awareness or memory of events before, during, and immediately after the seizure, and affecting behavior


Partial seizures are the most common type of seizure in people 1 year and older. In people older than 65 who have blood vessel disease of the brain, partial seizures are very common.


People with complex partial seizures may or may not remember any or all of the symptoms or events during the seizure.

Depending on where in the brain the seizure starts, symptoms can include:

Other symptoms may include:

  • Blackout spells, periods of time lost from memory
  • Changes in vision
  • Sensation of déjà vu (feeling like current place and time have been experienced before)
  • Changes in mood or emotion
  • Temporary inability to speak

Exams and Tests

The doctor will perform a physical exam. This will include a detailed look at the brain and nervous system.

An EEG (electroencephalogram) will be done to check the electrical activity in the brain. People with seizures often have abnormal electrical activity seen on this test. In some cases, the test shows the area in the brain where the seizures start. The brain may appear normal after a seizure or between seizures.

Blood tests may also be ordered to check for other health problems that may be causing the seizures.

Head CT or MRI scan may be done to find the cause and location of the problem in the brain.


Treatment for partial focal seizures includes medications, changes in lifestyle for adults and children, such as activity and diet, and sometimes surgery. Your doctor can tell you more about these options.

Alternative Names

Focal seizure; Jacksonian seizure; Seizure - partial (focal); Temporal lobe seizure; Epilepsy - partial seizures


Abou-Khalil BW, Gallagher MJ, Macdonald RL. Epilepsies. In: Daroff RB, Fenichel GM, Jankovic J, Mazziotta JC.Bradley's Neurology in Clinical Practice.

Wiebe S. The epilepsies. In: Goldman L, Schafer AI, eds.Goldman's Cecil Medicine.

Update Date 2/3/2015

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