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Consciousness describes a state where a person is aware of their surroundings and can respond to stimuli. Sleep is a normal state where a person is not conscious, but can still respond to certain stimuli, such as heavy touch, loud noises, or bright light. A person suffering a seizure also partially loses consciousness, although in some forms of seizure they may be aware of their surroundings. However, persons suffering a seizure are unable to respond to stimuli. Persons under general anasthesia are not conscious in order to prevent them from suffering pain. However, such persons can be brought back to consciousness by removing the application of the anasthetic.

As such, other forms of unconsciousness are always a sign of a serious medical condition. In such states, the patient cannot be brought back to consciousness without serious medical intervention. There are several causes of such unconsciousness, such as concussion, insulin shock, or blood loss.

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