signs and symptoms of iodine deficiency
In areas where there is little iodine in the diet, typically remote inland areas and semi-arid equatorial climates where no marine foods are eaten, iodine deficiency gives rise to hypothyroidism, symptoms of which are extreme fatigue, goiter, mental slowing, depression, weight gain, and low basal body temperatures.
This means that your thyroid problem could actually be an iodine deficiency problem. If you feel sluggish and tired, have difficulty losing weight, have dry skin, hair loss, constipation or cold sensitivity, it could all be related to hypothyroidism.