These conditions, collectively termed chemosensory dysfunctions, are many and varied, and they may trigger a person to complain of an odor than is not present; however, the diagnostic criteria for ORS require the exclusion of any such causes. They include pathology of the right hemisphere of the brain, substance abuse, arteriovenous malformations in the brain, and temporal lobe epilepsy.
These conditions, collectively referred to as chemosensory dysfunctions, encompass a multitude of symptoms and may prompt an individual to report a scent that is not actually present; however, the diagnostic criteria for ORS necessitate excluding any such underlying causes. They include brain pathology in the right hemisphere, substance abuse, arteriovenous malformations in the brain, and temporal lobe epilepsy.