Disorders of consciousness 


Being in a coma

Information for anyone whose friend or loved one is in a coma

A disorder of consciousness, or impaired conciousness, is a state where consciousness is affected by an injury to the brain.

Consciousness refers to both wakefulness and awareness. Wakefulness is the ability to open your eyes and have basic reflexes such as coughing, swallowing and sucking.

Awareness is associated with more complex thoughts and actions, such as following instructions, remembering, planning and communicating.

There are several different states of impaired consciousness, depending on how these abilities are affected. These include:

  • coma – when there are no signs of wakefulness or awareness
  • vegetative state – when a person is awake but showing no signs of awareness
  • minimally conscious state – when there is clear but minimal evidence of awareness that comes and goes

Read more about the features of disorders of consciousness.

Note that people with locked-in syndrome are conscious and aware, but completely paralysed and only able to control eye movement. Learn more about paralysis.

Why they happen



Read more about the causes of disorders of consciousness.

Making a diagnosis

A disorder of consciousness will only be confirmed after extensive testing to determine levels of wakefulness and awareness.

These examinations need to be carried out by someone experienced in disorders of consciousness, although the views of other healthcare professionals and family members will also be taken into consideration.

For some states of impaired consciousness, such as vegetative state, there are recommended criteria to help confirm a diagnosis.

Read more about diagnosing disorders of consciousness.

Treatment and care


  • providing nutrition
  • gently exercising their joints to prevent these from becoming tight

In some cases, a treatment called sensory stimulation may be used in an attempt to increase responsiveness. This involves stimulating the main senses, such as vision, hearing and smell. For example, a person's favourite song may be played to stimulate their hearing. However, it's not entirely certain how effective this treatment is.

If health professionals and family members agree there is no point in continuing treatment, the decision usually has to be referred to the courts before treatment can be withdrawn.

This would usually be considered if a person was in a state of impaired consciousness for at least 12 months, as by this point the chances of recovery are remote.

Read more about treating disorders of consciousness.


It's impossible to predict the chances of someone in a state of impaired consciousness improving. It largely depends on the severity and type of brain injury, the person's age and how long they've been in a state of impaired consciousness for.


There are only isolated cases of people recovering consciousness after several years. The few people who do regain consciousness often have severe disabilities caused by the damage to their brain.

Page last reviewed: 06/06/2013

Next review due: 06/06/2015


How helpful is this page?

Average rating

Based on 54 ratings

All ratings

Add your rating



Information and real stories about coping with different types of bereavement