In the process of hearing aid fitting, there have been individual hearing impaired patients who reported feeling headaches, stomachaches, or even toothaches after wearing hearing aids… Obviously, these “discomforts” have nothing to do with wearing hearing aids. (Excluding very rare cases where the voice is too loud or the hearing aid housing is too loud and causes headaches or toothaches.)
If the hearing aid of a hearing-impaired patient is uncomfortable to wear, be sure to ask the specific feeling of the discomfort, and then adjust it according to the relevant situation.
