Coma is when your eyes are shut for days, weeks, months, years. Loss of consciousness is when you are knocked out. When a person has a operation we lose conciousness. There is also another state of coma,loss of conciousness and that is comatose. That is when a person opens his eyes from being in a coma but still is not aware of his surroundings. With this kind of loss of conciousness a person is fed interveiniously. This happens with a serious head injury. They go thru wake and sleep modes but are completely unaware. They can not sit up, hold up their heads. They are completely limp. I know this because this happened to my son and lived like that for eight years. He is now in heaven.

unconscious- like faint.
Coma- brain will work but nothing is in action.

Coma, from the Greek word "koma," meaning deep sleep, is a state of extreme unresponsiveness, in which an individual exhibits no voluntary movement or behavior. Furthermore, in a deep coma, even painful stimuli (actions which, when performed on a healthy individual, result in reactions) are unable to affect any response, and normal reflexes may be lost.

Unconscious, is when a person is not aware of his physical state and is not in control of his actions, although he may respond involuntarily to painful stimuli or heat perceptions.

unconcious - reversible , its for less time
comatose - actual brain death ,mostly irreversible ,very few cases recover but morbidity is very high.

UNCONSCIOUSNESS IS FOR LESS TIME AND COMATOSE IS FOR MORE TIME.

Technically i don't know the difference,but to me the period of unconsciousness cud b the difference

unconscious - without the knowledge of brain
comatose - loss of brain power