Blackout

In medicine, the word blackout is a form of amnesia. The amnesia may be complete or partial. Such an amnesia can be provoked by: 
 Stress (biology) for example, before an examination.
 Alcohol: People suffering from such a conditions may also lose consciousness for a certain time.
 Interrupting the supply of oxygen or blood to the brain
 Injuries to the brain
 Various illnesses

After the cause is gone full mental powers are usually restored, although there may be a blank in memory.

Category:Health problems