In common cases , the swelling of the brain pressures the lower part brain . This part is called the brainstem . The brain stem controls consciousness and the nervous system . Persons whose brainstems are heavily damaged suffer from a coma . Persons suffering from a coma will not have any reactions . These reactions include to noise , heat , or any kind of movement . Other people suffering from can move , speak a little but most of them unaware of their environment . Generally , people suffering from...











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