In case of head injury, when providing assistance to the victim, it is necessary to:

Explanation

Lay the casualty down with head and upper back raised, in a half-lying position.

With a head injury the casualty should be placed half-lying, with the head and upper body slightly above the level of the body. This position lowers intracranial pressure and helps prevent bleeding and cerebral swelling from getting worse.

The common mistake is raising the legs. That is the anti-shock position, useful when blood pressure has dropped, because it drives blood toward the core — which is precisely why it is harmful after a head injury: it sends more blood to the head.

Until the ambulance arrives, avoid moving the casualty unnecessarily, keep the head and neck stable, and if they are unconscious, manage the airway.

Why the other answers are wrong

• Lay him down by raising his/her legs. — Raising the legs is the anti-shock position and increases intracranial pressure in a head injury.
• Lay him/her in a horizontal position. — A fully horizontal position does not reduce intracranial pressure; the half-lying position is required.