About TSH
TSH (Thyroid-Stimulating Hormone) is the pituitary gland's signal to the thyroid, telling it to produce more or less hormone based on your body's needs. It is the most sensitive early indicator of thyroid dysfunction — a rising TSH means the pituitary is compensating for a flagging thyroid (hypothyroidism), while low TSH suggests the thyroid is overactive (hyperthyroidism). Many people experience clear symptoms — fatigue, weight changes, mood shifts — at TSH values still within the standard 'normal' reference range.