[Serious manifestation of primary hypothyroidism]

Thyroid gland diseases are the most frequent endocrinopathy and can be often seen in adult population. They occur at least by 5% of the population and the occurence increases with age, in females aging 45 and more, as thyroid gland diseases in this age group are represented approximately by 20%. Due to a complex influence of thyroid hormones in humans, diagnosis of thyroid disease may remain unsuspected under other disease with typical symptoms; the most serious of them is cardiogenic manifestation. When thyroid disease suspected, methods of diagnostics are very comprehensive and broad. Treatment on time can prevent serious complications. Case-study presenting a female patient with untreated primary hypothyroidism that had caused serious cardiac symptoms.