Focal myoclonic seizure
A type of focal motor seizure characterized by sudden, brief (<100 ms) involuntary single or multiple contraction(s) of muscles(s) or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus.
What is Focal myoclonic seizure?
Focal myoclonic 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 myoclonic seizure that is severe, persistent, or accompanied by other warning signs, contact a qualified healthcare provider.
Possible conditions associated with Focal myoclonic seizure
The following conditions have been associated with Focal myoclonic seizure. Only a health professional can determine the underlying cause.
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Related symptoms
When to seek medical care
Seek urgent care if Focal myoclonic seizure is severe, sudden, or occurs with chest pain, difficulty breathing, confusion, severe weakness, or other serious symptoms.