BBHC Unfiltered

Hyperthyroidism Explained: Symptoms, Causes, Types, and Triggers

Nick Howarth

Published on: 01/01/2026

Hyperthyroidism is a condition in which the thyroid gland becomes overactive, producing excessive amounts of thyroid hormones—primarily T3 (triiodothyronine) and T4 (thyroxine). These hormones regulate metabolic rate, energy production, heart function, body temperature, and neurological activity. When they are produced in excess, the entire body is pushed into metabolic overdrive.