When the Pulse Races: The Connection Between Hyperthyroidism and Heart Health

The internal heat described in Donguibogam corresponds closely in modern medicine to hyperthyroidism. This condition develops when the butterfly-shaped thyroid gland at the front of the neck produces an excessive amount of thyroid hormone. Thyroid hormone regulates overall metabolism, functioning essentially as a control switch for energy expenditure in the body. When this regulatory switch remains locked in an overactive position, metabolic processes accelerate abnormally. The heart beats excessively fast, perspiration increases, tremors develop in the hands and feet, and weight loss may occur despite an increased appetite. Mentally, individuals often experience heightened anxiety over minor issues, reduced concentration, and emotional instability. This can create an exhausting cycle where nocturnal palpitations disrupt sleep, leading to daytime lethargy and irritability. Thyroid hormone acts directly on cardiomyocytes, increasing cardiac contractility and elevating heart rate. A persistent excess of thyroid hormone places continuous strain on the heart, potentially leading to serious complications such as arrhythmia or cardiomegaly. It also significantly impacts the autonomic nervous system by overstimulating sympathetic nerves and inducing a persistent fight-or-flight response. Consequently, the heart pounds and anxiety arises even without an external threat, resembling an alarm that sounds continuously. These symptoms can cause substantial distress and should not be dismissed merely as everyday stress. Women tend to be more sensitive to hormonal fluctuations, warranting careful attention to thyroid health. If these symptoms occur together and persist, seeking an accurate medical evaluation and diagnosis is essential.