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Concussion

Medically reviewed by Drugs.com. Last updated on Dec 16, 2022.

What is a Concussion?

Harvard Health Publishing

A concussion is a short-term disturbance in brain function caused by a head injury. A concussion often causes

Most head injuries happen during motor vehicle accidents, falls, sports, and assaults. Alcohol and drug use can be major contributing factors.

Usually there is direct trauma to the head (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.

Head imaging with MRI or CT scans of someone with a concussion rarely show obvious signs of brain injury.

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 at home if you have had a very minor injury. If your symptoms are serious or your neurological exam is abnormal, you will likely need a CT scan of your brain to look for signs of a more serious head injury.

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 often use the term post-concussion syndrome for these lingering symptoms. The duration of a post-concussion syndrome varies. Most people recover completely within 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

A person that has a concussion while playing sports must immediately stop. Return to play should not happen until the person has been evaluated by a health professional.

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.

There are no definitive guidelines regarding how long a person should rest. A reasonable approach is to avoid activities that are physically and mentally taxing for one to two days following the head injury. If symptoms recur when becoming more active again, slow down and notify your doctor.

No medication has been shown to speed recovery from a concussion. 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 medical 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 six 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 doctor if you are still experiencing 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
http://www.ninds.nih.gov/

American Academy of Neurology (AAN)
http://www.thebrainmatters.org/

Brain Injury Association of America
http://www.biausa.org/

Brain Trauma Foundation
http://www.braintrauma.org/


Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.