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A coma is a deep state of unconsciousness. It can occur as a complication of an illness, exposure to a drug, alcohol, or toxin, or as a result of injuries, such as head trauma. A coma is a medical emergency.

People in a coma generally recover but some don't. It can be very difficult to predict recovery when a person is in a coma. Sometimes a coma is followed by a persistent vegetative state.

Follow the links below to find trusted information about coma.

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Last reviewed: July 2016

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Coma - Brain Foundation

Coma (See also Acquired Brain Injury, Stroke) Description Coma is a state of unconsciousness in which a patient does not react with the surrounding environment

Read more on Brain Foundation website

Diabetic coma - Better Health Channel

Diabetic coma is a medical emergency and needs prompt medical treatment.

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Minimally Conscious State - Brain Foundation

Minimally Conscious State Description The minimally conscious state is a defined asseverely altered consciousness in which minimal but definite, sustained and/or reproduciblebehavioral evidence of awareness of self or environment is demonstrated

Read more on Brain Foundation website

Vegetative State - Brain Foundation

Vegetative State (Unresponsive Wakefulness Syndrome) Description A vegetative state is when a person is awake but showing no signs of awareness

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Locked-in Syndrome (LiS) - Brain Foundation

Locked-in Syndrome (LiS) Description Locked-in Syndrome (LiS) is a rare neurological disorder usually resulting from a lesion to a region of the brainstem called the pons, most frequently an ischemic pontine lesion

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