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 pain occurs when the Eustachian tube that runs from the middle ear to the back of the throat gets blocked. The Eustachian tube drains the fluids that is produced in the middle ear, so when it is blocked the fluid builds up, leading to pressure on the eardrum and the consequent pain.