For additional information visit Linking to and Using Content from MedlinePlus. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. 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).The aetiology may be physiological, pathological or pharmacological. Seizure (pupil size difference may remain long after seizure is over) A difference in pupil size between the eyes is known as anisocoria.Infection of membranes around the brain ( meningitis or encephalitis).Increased intracranial pressure, because of brain swelling, intracranial hemorrhage, acute stroke, or intracranial tumor.If you are concerned about headaches, seek the advice of your doctor, and seek immediate medical attention for signs of a head injury or stroke. Excess pressure in one eye caused by glaucoma Unequal pupils can result from damage to the brain from a stroke or injury, and is a sign that immediate medical attention is needed.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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