Fatigue and weakness
Fatigue and weakness are also common symptoms of an iodine deficiency. Some studies show that about 80% of people with low levels of thyroid hormone that occur due to iodine deficiency feel weak, sluggish, and tired. Weakness and fatigue [1] usually occur because the thyroid hormones help the body make energy. The body cannot make the required amount of energy needed to carry out daily activities when thyroid hormone levels are low. In the absence of sufficient iodine [2], your energy level may reduce making you feel weak.
According to a study on 2,546 people, weakness and fatigue are the most common symptoms of iodine deficiency and low thyroid hormone levels.