The thyroid and the brain are closely linked because thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), significantly impact brain function and development. These hormones are essential for maintaining cognitive functions, mood regulation, and overall mental well-being. Thyroid hormones influence neurotransmitters, brain structure, and the overall efficiency of the brain’s processes. As a result, when the thyroid doesn’t work properly, it can cause problems with how our brain functions, affecting things like memory, mood, and thinking. 

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