Medicine
First Aid for Head Injuries
Quick fact
The human brain is so soft that a violent blow can cause it to slosh inside the skull, tearing blood vessels; even a brief loss of consciousness doubles the risk of intracranial bleeding.
Why this is interesting
You see someone fall, hit their head hard, and now they're confused. Would you know what to do in the first few minutes that could prevent permanent brain damage?
Read the full explanation
Understanding First Aid for Head Injuries
Head injuries range from mild bumps to life-threatening trauma. The immediate goal of first aid is to prevent the injury from getting worse. Think of the brain and spinal cord as a delicate, jelly-like computer protected by a hard case (the skull and vertebrae). After a blow, swelling or bleeding inside the case can crush the brain. Your first aid actions—like keeping the person still, controlling external bleeding without pressing on a skull fracture, and monitoring consciousness—act like a temporary shield. You're not fixing the injury, but you're buying time until advanced medical care can relieve pressure inside the skull.
A deeper explanation
The dangerous mechanism in head injuries is often secondary injury. The primary injury happens at the moment of impact (bruising, tearing of tissue). Secondary injury occurs afterward due to swelling (cerebral edema) or bleeding (hematoma) that raises pressure inside the skull—intracranial pressure (ICP). High ICP squeezes brain tissue, cuts off blood flow, and can cause herniation (brain being pushed out of its normal position). First aid focuses on minimizing factors that increase ICP: keeping the head elevated if spinal injury is not suspected, avoiding tight collars, and ensuring oxygen supply by maintaining an open airway. Additionally, immobilizing the cervical spine prevents any movement that could damage an already unstable neck vertebrae—because head trauma often comes with neck injury. Recognizing red flags like unequal pupils, deteriorating consciousness, or worsening headache guides decision-making for calling emergency services.