Intake recommendations for iodine and other nutrients are provided in the Dietary Reference Intakes (DRIs) developed by the Food and Nutrition Board (FNB) at the Institute of Medicine of the National Academies (formerly National Academy of Sciences) [2].
Answer. The ear canal has very delicate skin; even a hair may cause itching in the ear. So no wonder itching or irritation is a common complaint from the hearing aid user who comes in for a follow up visit.
Causes of Earaches. 1  Ear Infection. An infection of the middle ear space behind the eardrum is the most common cause. 2  Swimmer's Ear. An infection or irritation of the skin that lines the ear canal. 3  Ear Canal Injury. A cotton swab or fingernail can cause a scrape in the canal.  Ear Canal Abscess.