Are there various stages of coma?

Stupor and coma. Classical stages include lethargy, stupor, semi-coma and full coma. All of this is based on the area of the brain which is mostly affected, and the findings on exam correlating with the extent of the problem. The physician can adjust therapy, provide a prognosis, and make decisions based on clinical exam findings. Coma can be chronic, over weeks or months, or brief, such as a concussion.
Coma stages. The glasgow coma scale involves three determinants: eye opening, verbal responses and motor response (movement). These determinants are evaluated separately according to a numerical value that indicates the level of consciousness and the degree of dysfunction. Scores run from a high of 15 to a low of 3. Persons are considered to have experienced a "mild" brain injury when their score is 13 to 15.