The Small Gland That Can Affect Almost Everything

The thyroid is a small gland in the neck with an outsized influence on energy, metabolism, mood, and temperature. Thyroid disorders are markedly more common in women, and their symptoms overlap so heavily with depression, stress, and menopause that they are frequently attributed to something else.

An underactive thyroid (hypothyroidism) typically brings fatigue, weight gain, cold intolerance, constipation, dry skin, hair thinning, low mood, and heavier periods. The most common underlying cause is Hashimoto's, an autoimmune condition that can simmer for years — sometimes before standard tests look clearly abnormal. An overactive thyroid (hyperthyroidism), by contrast, can cause anxiety, palpitations, weight loss, and tremor, and is sometimes mistaken for a primary anxiety disorder.

Testing is straightforward, beginning with TSH and free T4, and often adding thyroid antibodies for a fuller picture. Where treatment is needed, it is well established and effective. If you have been told your thyroid is 'borderline' but you still feel unwell, that mismatch is worth revisiting rather than dismissing.