3. Fatigue, weakness, lack of energy
People with low thyroid hormone levels that occur because of iodine deficiency, suffer from physical and mental fatigue, weakness, drowsiness and low body temperature (hypothermia).
These symptoms occur because thyroid hormones help the body to produce energy, and since thyroid hormones are low due to iodine deficiency, the person has less energy than they had before. The metabolism is slowed down, which means that less calories are burned for energy. Less energy means that the muscles do not work as efficiently. This makes a person feel weak. The way to tell fatigue from simple tiredness is its persistent nature – fatigue does not go away with rest and can appear very suddenly and seemingly out of nowhere.
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