Your thyroid is working, but not well enough
The thyroid gland needs iodine to produce T3 and T4 hormones. When iodine supply drops even slightly below what the gland requires, it compensates by enlarging, a condition called goitre, or by slowing hormone output without enlarging at all. That second pattern, subclinical hypothyroidism, is the one most people miss. Thyroid function tests come back borderline. The doctor says watch and wait. But the body is already rationing hormone production, and the effects accumulate quietly over months.
