Result from a blow to the head producing a concussion, skull fracture, or contusion that may affect normal functioning (e.g., consciousness, motor ability, sensation, intelligence, or emotion).
Damage to the head as a result of a fall or other accident, assault, or wound, the main concern being whether the brain is affected. The brain is protected by a bony skull, and sometimes even if the skull itself is fractured, damage may still be superficial. However, the brain can be damaged by certain types of head injuries that leave little or no external sign, as in some kinds of child abuse in which a child is violently shaken. Even mild head injuries commonly produce headaches and may involve unconsciousness, coma, or amnesia. Associated symptoms may include paralysis, sometimes with muscle weakness and loss of feeling, continual vomiting, loss or deterioration in clarity and consciousness, and eye and vision problems, such as double vision or pupils of unequal size. Any head injury should be referred to a physician; if a child loses consciousness, even briefly, the doctor may want to take X-rays of the skull to check for skull fracture or a CT scan to check for hemorrhage or clots in the brain and may well suggest that the child be hospitalized for observation.
Any injury that results in damage to the brain or trauma to the head. Head injuries, also called traumatic brain injuries, are quite common.
Any injury to the head, whether associated with a skull fracture or not. Patients with head injuries should be assessed for signs of neurological damage, which may not develop at once. Patients who after a head injury are or have been unconscious, are drowsy, vomiting, confused or have any focal neurological signs for example, blurred vision or a motor or sensory malfunction should be seen by a doctor. Particular care should be taken with individuals who have consumed alcohol and sustained a head injury in a fight, fall or vehicle accident. Symptoms indicative of a severe head injury may be attributed (wrongly) to the effects of alcohol, and crucial time thus lost in treating the injury.
Head injuries can happen due to various factors, including traffic accidents, sports-related incidents, falls, assaults, work-related accidents, and home mishaps, as well as bullet wounds. Minor head injuries are relatively common, and many individuals experience them at least once in their lives. However, only a small fraction of these injuries are severe enough to necessitate medical treatment.
A head injury has the potential to harm the scalp, skull, or brain. Minor injuries typically do not affect the underlying brain. Even in cases of a skull fracture or a split scalp, the brain might remain undamaged. However, a strong impact to the head can result in severe shaking of the brain, which can sometimes lead to brain damage, even in the absence of visible external signs of injury.
A forceful impact often results in the bruising of brain tissue, leading to the death of some brain cells in the affected area. When an object pierces the skull, foreign material and dirt may be introduced into the brain, potentially causing infection. In addition, a blow or a penetrating injury can cause tears in blood vessels, resulting in brain hemorrhage (bleeding in or around the brain). Swelling of the brain may occur following a head injury, especially noticeable in cases of bullet wounds due to the extensive damage caused by their high velocity. Moreover, if the skull is fractured, bone fragments may be driven into the underlying brain.
A mild head injury may show minimal symptoms, possibly limited to a slight headache. In certain cases, there could be a concussion, leading to confusion, dizziness, and blurred vision, which may persist for several days. However, more severe head injuries, especially from forceful blows to the head, may cause unconsciousness lasting longer than a few minutes, or even result in a coma (a state of unconsciousness and unresponsiveness to stimuli), which can be life-threatening.
Post-concussive amnesia, which involves the loss of memory of events that occurred after an accident, can occur, particularly when the skull has been fractured. This type of amnesia typically persists for more than an hour after regaining consciousness. Additionally, there may be pretraumatic amnesia, which involves the loss of memory of events that occurred before the accident. The severity of the brain injury directly correlates with the duration of unconsciousness and amnesia, with more serious injuries likely to lead to longer periods of unconsciousness and memory loss.
Following a severe brain injury, individuals may experience muscular weakness or paralysis and a loss of sensation.
Symptoms such as continuous vomiting, unequal pupil sizes, double vision, or a declining level of consciousness indicate progressive brain damage.
Examinations may involve skull X-rays, as well as MRI or CT scanning, which provide cross-sectional or three-dimensional images of body structures. If a blood clot is present inside the skull, it can be life-threatening and necessitate surgical removal. Additionally, severe skull fractures might also require surgery.
It may take several days to recover from a concussion. If the brain has suffered damage, there could be lasting physical or mental disability. Recovery from a significant head injury can be a gradual and slow process, with signs of progressive improvement potentially visible for several years after the injury.