During a coma, a person is in a state of unconsciousness. They do not show intentional response or movement, the eyes remain closed, and they cannot be awakened or obey commands during this state.
The person may show some level of response to touch, pain, and verbal commands, so it is more accurate to talk about depth of coma rather than an all-or-nothing state. Family members often have trouble accepting their loved one is in a coma when there are basic responses.
A coma can be chemically induced to accelerate healing, protect the brain from secondary damage, or to relieve severe chronic pain during healing after a traumatic brain injury (TBI) or other kind of brain disorder.