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.
This can block the Eustachian Tube. As a result air cannot reach the middle ear, so the pressure there decreases. When the pressure is lower in the middle ear than in the ear canal, it causes the eardrum to bulge inward. The bulging of the ear-drum can cause pain and as a result, one may experience tinnitus symptoms. So yes, I think that sinus infection can very much cause Tinnitus.