![]() ![]() Their pupils may be affected in a number of different ways.They may be holding their body in an unusual posture.No amount of sensory stimulation can wake them up.Symptoms of comaThe symptoms of coma include: In some cases a person can descend into a persistent vegetative state, where the brain has lost its higher functions (including consciousness, self-awareness and personality) but retains involuntary functions such as breathing and swallowing, heart rate and blood pressure. A wide range of illnesses, conditions and events can cause coma.Ĭoma occurs when there is a serious problem with the brain’s arousal system (the reticular activating system), or with its communications between other brain areas (such as the cerebral hemispheres) and the brain’s activity becomes impaired. A person in a coma can’t even respond to pain. Coma is a state of consciousness that is similar to deep sleep, except no amount of external stimuli (such as sounds or sensations) can prompt the brain to become awake and alert.
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