Focal-onset seizure
A focal-onset seizure is a type of seizure originating within networks limited to one hemisphere. They may be discretely localized or more widely distributed, and may originate in subcortical structures.
What is Focal-onset seizure?
Focal-onset seizure is a symptom that people may experience for many reasons. It can be related to infections, chronic conditions, injuries, medication effects, or other health changes. The presence of this symptom alone does not diagnose any condition.
If you have Focal-onset seizure that is severe, persistent, or accompanied by other warning signs, contact a qualified healthcare provider.
Possible conditions associated with Focal-onset seizure
The following conditions have been associated with Focal-onset seizure. Only a health professional can determine the underlying cause.
17q11 microdeletion syndrome
17q11 microdeletion syndrome is a medical condition that may be associated with various symptoms and signs.
B-cell immunodeficiency, distal limb anomalies, and urogenital malformations
B-cell immunodeficiency, distal limb anomalies, and urogenital malformations is a medical condition that may be associat...
Bilateral generalized polymicrogyria
Bilateral generalized polymicrogyria is a medical condition that may be associated with various symptoms and signs.
Bilateral perisylvian polymicrogyria
Bilateral perisylvian polymicrogyria is a medical condition that may be associated with various symptoms and signs.
Bilateral polymicrogyria
Bilateral polymicrogyria is a medical condition that may be associated with various symptoms and signs.
CDKL5-deficiency disorder
CDKL5-deficiency disorder is a medical condition that may be associated with various symptoms and signs.
Cocaine intoxication
Cocaine intoxication is a medical condition that may be associated with various symptoms and signs.
Cysticercosis
Cysticercosis is a medical condition that may be associated with various symptoms and signs.
DNM1L-related encephalopathy due to mitochondrial and peroxisomal fission defect
DNM1L-related encephalopathy due to mitochondrial and peroxisomal fission defect is a medical condition that may be asso...
Developmental and epileptic encephalopathy 122
Developmental and epileptic encephalopathy 122 is a medical condition that may be associated with various symptoms and s...
Developmental and epileptic encephalopathy with spike-wave activation in sleep
Developmental and epileptic encephalopathy with spike-wave activation in sleep is a medical condition that may be associ...
Dravet syndrome
Dravet syndrome is a medical condition that may be associated with various symptoms and signs.
Related symptoms
When to seek medical care
Seek urgent care if Focal-onset seizure is severe, sudden, or occurs with chest pain, difficulty breathing, confusion, severe weakness, or other serious symptoms.