Unconscious is a state of incapacitation in Wasteland 2.
A temporary loss of consciousness, generally resulting from a concussion. An unconscious character is unresponsive and unaware of his surroundings. He will regain consciousness after a time; surgeons may facilitate the process by maintaining circulation and respiration.
A party member may enter the unconscious state if they get knocked out when their CON drops to zero. They do not lose any CON in this state and will regain consciousness automatically after some time if they are not attacked.
It can be treated with a trauma kit. The unconscious state also automatically leads to the Mending status effect where the party member recovers some amount of CON over time.