If someone falls, gets hit in the head, or is in a vehicle accident, watch for signs of brain injury. It can be difficult to tell if there is brain injury if the person has been drinking or using drugs because many of these signs can be the same. Also check anyone with a head injury for neck or spine injuries, as these two can go together.
Get help for any of these signs:
These signs may happen hours after the injury:
Watch the person constantly. If s/he goes to sleep, wake her every few hours to see if s/he can still answer questions and think clearly. In the hours after the injury, if the person becomes more confused, gets a headache that gets worse and worse, or loses consciousness or has a seizure, there is likely bleeding inside the skull and immediate medical help is needed.
Head wounds bleed a lot. If you are sure the spine is not injured, ask the person to sit up, or prop her up, to decrease bleeding, as you seek medical assistance.
Source : Where there is no doctor