The main identifiable symptom of transient global amnesia is the sudden, but temporary, loss of short-term memory and not being able to form new memories.
- Anxiety and agitation
- Repeatedly asking questions about what is happening
- Retaining personal identity during the episode
- Able to complete complex routine tasks during the episode
- Absence of signs suggesting damage to the brain tissue
- Episodes end in 1-8 hours, no more than 24
Causes and Risk Factors
The cause of transient global amnesia is unknown.
People older than 50 are more likely to experience TGA. Research suggests there also may be a link between patients who have a history of migraines and those who experience TGA.
In most cases, there is no activity that triggers a transient global amnesia episode. In rare cases, certain events can trigger an episode, including:
- Hard physical activity
- Sexual intercourse
- Sudden exposure to very hot or very cold water
- Emotional stress
- Mild head trauma