What is a head injury?
A head injury is a broad term that describes many injuries that occur to the scalp,
skull, brain, and underlying tissue and blood vessels in the head. Head injuries are
also commonly referred to as brain injury, or traumatic brain injury (TBI), depending
on the extent of the head trauma.
Head injuries are one of the most common causes of disability and death in adults.
The injury can be as mild as a bump, bruise (contusion), or cut on the head. Or it
can be moderate to severe in nature due to a concussion, deep cut or open wound, fractured
skull bone(s), or from internal bleeding and damage to the brain.
These are some of the different types of head injuries:
Concussion. A concussion is an injury to the head area that may cause instant loss of awareness
or alertness for a few minutes up to a few hours after the traumatic event.
Skull fracture. A skull fracture is a break in the skull bone. There are 4 major types of skull fractures:
Linear skull fractures. This is the most common type of skull fracture. In a linear fracture, there is a break
in the bone. But it does not move the bone. For this type of fracture, your healthcare
provider may observe you in the hospital for a brief time. Usually, you will not need
treatment and you can resume normal activities in a few days.
Depressed skull fractures. You may or may not have a cut in the scalp with this type of fracture. In this fracture,
part of the skull is actually sunken in from the trauma. This type of skull fracture
may require surgery, depending on the severity, to help correct the deformity.
Diastatic skull fractures. These fractures occur along the suture lines in the skull. The sutures are the areas
between the bones in the head that fuse during childhood. In this type of fracture,
the normal suture lines are widened. Newborns and older infants are more likely to
get these types of fractures.
Basilar skull fracture. This is the most serious type of skull fracture. It involves a break in the bone at
the base of the skull. With this type of fracture, you may have bruises around the
eyes and a bruise behind the ear. You may also have clear fluid draining from the
nose or ears due to a tear in part of the covering of the brain. If you have this
type of fracture, you will require close observation in the hospital.
Intracranial hematoma (ICH). An intracranial hematoma is a blood clot in or around the brain. There are different
types of hematomas. They are classified by their location in the brain. These can
cause mild head injuries to quite serious and potentially life-threatening injuries.
The different types of intracranial hematomas include:
Epidural hematoma. Epidural hematomas occur when a blood clot forms underneath the skull, but on top
of the tough covering that surrounds the brain (the dura). They usually come from
a tear in an artery that runs just under the skull. Epidural hematomas are usually
associated with a skull fracture.
Subdural hematoma. Subdural hematomas occur when a blood clot forms underneath the skull and underneath
the dura, but outside of the brain. These can form from a tear in the veins that go
from the brain to the dura, or from a cut on the brain itself. They are sometimes,
but not always, associated with a skull fracture.
Contusion or intracerebral hematoma. A contusion is a bruise to the brain itself. A contusion causes bleeding and swelling
inside of the brain around the area where the head was struck. Contusions may occur
along with a fracture or other blood clots. Bleeding that occurs inside the brain
itself can sometimes occur spontaneously. When trauma is not the cause, the most common
causes are long-standing high blood pressure in older adults, bleeding disorders in
either children or adults, the use of medicines that cause blood thinning, or certain
Subarachnoid hemorrhage. This is when there is bleeding into the cerebrospinal fluid
(CSF), the fluid that covers the brain. It is often linked with a subdural hemorrhage
or contusion. It can also occur without trauma when there are abnormalities in the
blood vessels, such as aneurysms.
Diffuse axonal injury (DAI). These injuries are common and are usually caused by shaking of the brain back and
forth, which can happen in car accidents, from falls, or shaken baby syndrome. Diffuse
injuries can be mild, such as with a concussion, or may be very severe, as in diffuse
axonal injury. If severe, you may be in a coma for a prolonged period, with injury
to many different parts of the brain.
Penetrating injuries. These can result from bullets or other projectiles.
What causes a head injury?
There are many causes of head injury in children and adults. The most common traumatic
injuries are from motor vehicle accidents (automobiles, motorcycles, or struck as
a pedestrian), violence, falls, or child abuse. Subdural hematomas and brain hemorrhages
can sometimes happen spontaneously. The most common causes of head injury depend on
age. Older adults tend to be at risk from falls, while younger people may be more
at risk from contact sports, motor vehicle accidents, or violence.
When there is a direct blow to the head, shaking of the child, or when a whiplash-type
injury occurs, the brain jolts backwards and hits the skull on the opposite side,
causing a bruise. The jarring of the brain against the sides of the skull can cause
tearing of the internal lining, tissues, and blood vessels that may cause internal
bleeding, bruising, or swelling of the brain.
Who is at risk for a head injury?
Young children, older adults, and males are at most risk for head injuries. Those
who don’t use child car seats, seat belts, or safety helmets are also at increased
risk for head injuries.
What are the symptoms of a head injury?
Symptoms vary depending on the severity of the head injury. These are the most common
symptoms of a head injury.
Mild head injury
Raised, swollen area from a bump or a bruise
Small, superficial (shallow) cut in the scalp
Sensitivity to noise and light
Lightheadedness or dizziness
Problems with balance
Problems with memory or concentration
Change in sleep patterns
Ringing in the ears (tinnitus)
Alteration in taste
Fatigue or lethargy
Moderate to severe head injury
This requires medical attention right away. Symptoms may include any of the above
Loss of consciousness
Severe headache that does not go away
Repeated nausea and vomiting
Loss of short-term memory, such as difficulty remembering the events that led right
up to and through the traumatic event
Weakness in one side or area of the body
Pale skin color
Seizures or convulsions
Behavior changes including irritability
Blood or clear fluid draining from the ears or nose
One pupil (dark area in the center of the eye) is dilated, or looks larger, than the
other eye and doesn't constrict, or get smaller, when exposed to light
Deep cut or laceration in the scalp
Open wound in the head
Foreign object penetrating the head
Coma (when you are unconscious and can’t be awakened, don’t respond to stimuli)
Vegetative state (when you have lost thinking abilities and awareness of your surroundings,
but can do basic functions such as breathing and blood circulation)
Locked-in syndrome (a neurological condition in which a person is conscious and can
think and reason, but can’t speak or move)
The symptoms of a head injury may look like other problems or medical conditions.
Always see your healthcare provider for a diagnosis.
How is a head injury diagnosed?
The full extent of the head injury may not be completely understood immediately after
the injury. You will need comprehensive evaluation and testing. A physical exam and
other tests help make the diagnosis of a head injury. During the exam, the healthcare
provider will ask about your medical history and how you were injured. Trauma to the
head can cause neurological problems and may require further medical follow up.
Diagnostic tests may include:
X-ray. This test uses electromagnetic energy beams to make images of internal tissues, bones,
and organs onto film.
CT scan. This procedure uses a combination of X-rays and a computer to make detailed images
of any part of the body, including the bones, muscles, fat, and organs. CT scans are
more detailed than general X-rays.
Electroencephalogram (EEG). This procedure records the brain's continuous, electrical activity by means of electrodes
attached to the scalp.
MRI. This test uses large magnets, radio waves, and a computer to make detailed images
of organs and structures in the body.
How is a head injury treated?
Treatment will depend on your symptoms, age, and general health. It will also depend
on how severe the condition is.
Depending on the severity of the injury, treatment may range from ice and rest to
observation to surgery.
For a severe head injury, you are monitored for increased intracranial pressure (pressure
inside the skull). Head injury may cause the brain to swell. Since the brain is covered
by the skull, there is only a small amount of room for it to swell. This causes pressure
inside the skull to increase, which can lead to brain damage.
Intracranial pressure is measured in one of two ways.
One way is to place a small hollow tube (catheter) into the fluid-filled space in
the brain (ventricle).
The second way is to use a small, hollow device (bolt) placed through the skull into
the space just between the skull and the brain.
Your healthcare provider will insert one or both devices in the intensive care unit
(ICU) or in the operating room. He or she will then attach the device to a monitor
that gives a constant reading of the pressure inside the skull. If the pressure goes
up, it can be treated right away. While the device is in place, you will be given
medicine to stay comfortable. Your healthcare provider will remove the device when
the swelling has gone down and there is little chance of more swelling.
What are possible complications of a head injury?
A head injury can result in loss of muscle strength, fine motor skills, speech, vision,
hearing, or taste function, depending on the brain region involved and the severity of
brain damage. Long- or short-term changes in personality or behavior may also occur.
You may need long-term medical and rehabilitative (physical, occupational, or speech
What can I do to prevent a head injury?
The key to head injury prevention is to promote a safe environment for children and
adults and to prevent head injuries from occurring in the first place. The following
measures can help prevent head injury:
Use car seats and seat belts when riding in the car and helmets (when worn properly)
for activities, such as bicycle riding, in-line skating, skiing, and skateboarding.
Prevent falls. Since older adults are prone to falls, it is important to make their
living areas safe by removing throw rugs or clutter that may cause them to trip, installing
handrails in the bathroom and stairways, and assuring that there is good lighting.
For young children, it is important to secure windows with window guards and safety
When should I call my healthcare provider?
Seek medical attention right away if any of these occur:
A cut (laceration)
Persistent or increasing sleepiness or confusion
Seizure, repeated vomiting, or severe headache
Inability to feel an arm or leg or recognize people
Loss of balance
Difficulty speaking, seeing, or breathing
Loss of consciousness
Key points about head injury
A head injury is a broad term that describes many injuries that occur to the scalp,
skull, brain, and underlying tissue and blood vessels in the head.
The most common traumatic injuries are from motor vehicle accidents, violence, falls,
or child abuse.
Moderate to severe head injury requires immediate medical attention.
Severe head injury requires close monitoring for increased intracranial pressure.
Prevention is most important by promoting a safe environment for children and adults
through the use of car seats, seat belts, and helmets. Also remove tripping and fall
hazards in the home.
Tips to help you get the most from a visit to your healthcare provider:
Know the reason for your visit and what you want to happen.
Before your visit, write down questions you want answered.
Bring someone with you to help you ask questions and remember what your provider tells
At the visit, write down the name of a new diagnosis, and any new medicines, treatments,
or tests. Also write down any new instructions your provider gives you.
Know why a new medicine or treatment is prescribed, and how it will help you. Also
know what the side effects are.
Ask if your condition can be treated in other ways.
Know why a test or procedure is recommended and what the results could mean.
Know what to expect if you do not take the medicine or have the test or procedure.
If you have a follow-up appointment, write down the date, time, and purpose for that
Know how you can contact your provider if you have questions.