![]() A person with a concussion must be taken to the emergency room. However, when one pupil is more dilated than the other, it could be the sign of a structural brain injury that requires immediate emergency attention. This can happen when the body is under stress due to excitement, nervousness or anxiety. Our pupils can become dilated when the autonomic nervous system’s sympathetic branch is stimulated and the fight or flight response is triggered. Pupil dilation is not a reliable sign of concussion, particularly when both pupils are dilated equally. And a person who loses consciousness as a result of some type of head trauma doesn’t necessarily have a concussion. A person with a concussion always loses consciousness.Ī concussion involves the loss of consciousness only about 10 percent of the time. A concussion can’t be ruled out simply because the head was not directly involved in the incident. SEE ALSO: What Happens When You Get a Concussion - and What Happens Nextįor example, a person in a car accident may sustain a concussion even though he or she had no direct head trauma. This causes a temporary change in the brain’s energy metabolism, resulting in concussion symptoms. The cause could be an indirect blow somewhere else on the body that results in the head and brain moving rapidly back and forth. Not all concussions are the result of a blow to the head. Duplication for commercial use must be authorized in writing by ADAM Health Solutions.Misconceptions about concussion A concussion happens only with a blow to the head. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. ![]() This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Injury to the carotid or vertebral arteryĪ.D.A.M., Inc.Tumor, mass, or lymph node in the upper chest or lymph node causing pressure on a nerve may cause decreased sweating, a small pupil, or drooping eyelid all on the affected side (Horner syndrome).Seizure (pupil size difference may remain long after seizure is over).Infection of membranes around the brain ( meningitis or encephalitis).Increased intracranial pressure, because of brain swelling, intracranial hemorrhage, acute stroke, or intracranial tumor.Excess pressure in one eye caused by glaucoma.Brain tumor or abscess (such as, pontine lesions).Bleeding inside the skull caused by head injury.Other causes of unequal pupil sizes may include: Other medicines that get in the eyes, including medicine from asthma inhalers, can change pupil size. The use of eye drops is a common cause of a harmless change in pupil size.
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