Caloric irrigation is a test where air or water (depending on the type of equipment used) is sent into the ear to compare the responses of the left and right ears. It allows the audiologist to determine if the ears respond the same to stimulation or if one or both ears have an abnormally low or high response. This test is not always very comfortable for patients as it can evoke severe dizziness and nausea in some patients. Although it does not cause any harm, it’s usually done at the end of the evaluation so the patient can rest after it’s completed.