What Is It?
A concussion is a short-term disturbance in brain function caused by a head injury. A concussion causes:
About 8 million people suffer head injuries in the United States each year. Less than 10% require hospitalization, and most of these people have only minor injuries. About half of all head injuries happen during motor vehicle accidents. Falls, sports and assaults cause the rest. Alcohol and drug use are major contributing factors.
Most head injuries result from direct trauma (for example, the head hitting the ground or the windshield of a car). In the elderly, serious head injuries can result from even minor falls. Injuries also can occur from rapid acceleration or deceleration, as may happen in a whiplash injury. People who injure their heads often injure their necks, too. Magnetic resonance imaging or computed tomography (CT) scans of someone with a concussion rarely show obvious signs of brain injury, although doctors believe the symptoms are caused by swelling and damage to nerve fibers in the brain. Occasionally, minor head trauma can trigger a more serious problem such as bruising of the brain tissue (brain contusion) or bleeding within the head (subdural hematoma or subarachnoid hemorrhage). Bleeding and other complications of minor head injuries appear to be more common in the elderly and in people taking blood thinners such as warfarin (Coumadin).
Symptoms
A concussion can cause any or all of the following symptoms:
Symptoms most often appear immediately after the injury. However, in some cases, a person will feel fine at first and have the symptoms minutes to hours later.
Symptoms such as coma (unresponsiveness), seizures or paralysis or weakness of an arm or leg suggest a more serious form of head injury.
Diagnosis
A doctor should check anyone who has a head injury, especially if the person lost consciousness or showed a change in thinking, such as confusion or memory loss. A doctor usually will want to know:
The doctor will do a thorough physical and neurological exam. The doctor will check your blood pressure, pulse, vision, the way your eyes respond to light, reflexes and balance, and your ability to answer questions and remember things. If a doctor sees you immediately after a head injury, the examination may be repeated over several hours to make sure you are not getting worse.
If you have mild symptoms, are awake and alert, and have a normal examination, your doctor may just monitor you without doing any more tests. This monitoring can be done in the hospital or at home if you have had a very minor injury. If your symptoms are serious or your neurological exam is abnormal, you will probably will need a CT scan of your brain to look for the type of bruising or bleeding that requires emergency treatment.
If you are sent home, have someone stay with you for the first 24 to 48 hours because symptoms can become worse quickly or you could lose consciousness if your injury is more serious than your doctor suspected.
Expected Duration
Young people and athletes may recover from a head injury in minutes or hours. Some people experience lingering symptoms such as headache, dizziness, disrupted sleep, irritability and poor concentration for weeks or even months. In general, the more severe the concussion, the longer the recovery period. Doctors once believed that these symptoms, called post-concussion syndrome, were mainly psychological, but we now understand they are caused by subtle damage to the brain. Most people with minor head injuries recover completely over a period of three months.
Repeated minor injuries over a short period greatly increase the risk of serious or permanent brain damage. Young people who play contact sports are at particular risk of these injuries. If you have had a head injury, talk to your doctor about when it is safe to return to your usual activities, including contact sports.
Prevention
Accidents, including head injuries, are the leading cause of death in young people. Many of these accidents are related to drug and alcohol use. Many accidents can be prevented by avoiding dangerous activities or wearing safety equipment.
To help prevent head injuries:
Treatment
Most minor head injuries improve with rest and observation. Your doctor may choose to observe you in the hospital or may send you home under the care of a responsible adult. The doctor will give this person specific instructions about watching for danger signs.
Headache and neck pains can be treated with over-the-counter pain relievers, such as acetaminophen (Tylenol and other brand names). If you have more severe pain, your doctor may give you a prescription pain reliever.
When To Call a Professional
Call for emergency help if you find someone unconscious at an accident scene. Seek immediate attention if someone with a head injury experiences any of the following symptoms:
Even if a head injury appears minor, and the symptoms are mild, certain people are at high risk of serious complications. Call a doctor or go to an emergency room immediately if an injured person:
Prognosis
Most people with minor head injuries recover without any problems. Keep in mind, however, that some symptoms (headaches, dizziness, difficulty concentrating) may improve slowly over 6 to 12 weeks. Recovery will probably be slower in people whose injuries resulted in long periods of unconsciousness or amnesia. Recovery is also slower in the elderly, in those with previous head trauma, and in people with psychiatric or substance abuse problems.
A small percentage of people who suffer minor head injury may develop permanent disabilities or a condition called persistent post-concussive syndrome. This may include headaches, dizziness and difficulty concentrating. Consult your doctorif you still experience any symptoms three months after your head injury. Although there is no known cure for this condition, treatment is available for many of the symptoms.
Additional Info
National Institute of Neurological Disorders and Stroke
P.O. Box 5801
Bethesda, MD 20824
Phone: 301-496-5751
Toll-Free: 1-800-352-9424
TTY: 301-468-5981
http://www.ninds.nih.gov/
American Academy of Neurology (AAN)
1080 Montreal Ave.
St. Paul, MN 55116
Phone: 651-695-2717
Toll-Free: 1-800-879-1960
Fax: 651-695-2791
http://www.thebrainmatters.org/
Brain Injury Association of America
1608 Spring Hill Road
Suite 110
Vienna, VA 22182
Phone: 703-761-0750
Toll-Free: 1-800-444-6443
Email: info@biausa.org
http://www.biausa.org/
Brain Trauma Foundation
708 Third Ave.
New York, NY 10017
Phone: 212-772-0608
http://www.braintrauma.org/
