system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do medics keep you awake when you’ve had a traumatic injury? Why would being unconscious be more dangerous?
gpt
Until the patient has time to get to a hospital and get good diagnosis, it is hard for anyone in the field to determine (other than gross external injuries) what actually is the most urgent issue. The patient is actually the best guide (location of pain, what happened etc) to assist them for immediate treatment. They will often want to know if the patient has any existing conditions, allergies or on medication as this informs them what they should avoid.

In the case of head injuries and internal bleeding, in particular, there might be very little external signs. But if the patient cannot maintain consciousness or follow simple instructions, it might be indicative that there could be trauma and this needs more attention. 

Once a patient loses consciousness, a large part of this feedback mechanism is lost.