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.
Ear canals are very sensitive, so the symptoms of infection are often clear, including: 1  head shaking. 2  odors. 3  scaly skin.  whining and pawing at the affected 1  ear. dark, smelly discharge.  redness and 1  swelling. itchiness.