Hyperthyroidism men
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Hyperthyroidism in Men: Clinical Manifestations, Endocrine Disruptions, and Sexual Dysfunction
Prevalence and Causes of Hyperthyroidism in Older Men
Hyperthyroidism is notably prevalent among older men, with its incidence increasing significantly in individuals over the age of 65. The prevalence of hyperthyroidism in this demographic ranges from 0.7% to 4%, including subclinical cases . The primary causes of hyperthyroidism in older men include toxic multinodular goiter and autonomously functioning solitary nodules, which account for over 70% of cases in iodine-deficient areas. Exogenous sources such as iodine-containing compounds and medications like amiodarone also contribute to the condition .
Clinical Manifestations in Older Men
The clinical presentation of hyperthyroidism in older men often differs from that in younger individuals. Older men frequently exhibit atypical symptoms, including nonspecific signs and cardiovascular complications such as atrial fibrillation and other arrhythmias . These manifestations necessitate a tailored therapeutic approach that considers the patient's age, cardiovascular risk factors, and comorbidities .
Neuroendocrine Disturbances
Hyperthyroidism disrupts various neuroendocrine axes, including the somatotropic axis. Studies have shown that hyperthyroid men experience a higher frequency of growth hormone (GH) secretory bursts, increased GH secretion per burst, and a higher overall 24-hour GH production rate compared to euthyroid men . These alterations highlight the extensive impact of hyperthyroidism on endocrine regulation.
Impact on Reproductive Hormones and Seminal Parameters
Hyperthyroidism significantly affects the hypothalamic-pituitary-testicular axis and seminal parameters in men. Elevated levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and prolactin (PRL) are observed, along with increased concentrations of sex hormones such as testosterone and estradiol Abalovich1999Ruder1971Chopra1974. Despite high total testosterone levels, bioavailable testosterone is often reduced, leading to hypoandrogenism . Seminal abnormalities, including asthenospermia, hypospermia, oligospermia, necrospermia, and teratospermia, are common, with significant improvement upon achieving euthyroidism .
Sexual Dysfunction and Psychological Impact
Men with hyperthyroidism frequently experience sexual dysfunction, including reduced erectile function, intercourse satisfaction, orgasmic function, and overall sexual satisfaction. These issues are more pronounced in cases of Graves' disease compared to other causes of hyperthyroidism . Additionally, hyperthyroidism is associated with depressive symptoms, further compounding the impact on sexual health Krysiak2019Gabrielson2019.
Conclusion
Hyperthyroidism in men, particularly older men, presents unique clinical challenges due to its atypical symptoms and significant endocrine disruptions. The condition affects various hormonal axes, leading to reproductive and sexual dysfunctions. Recognizing and addressing these issues through appropriate management strategies can significantly improve the quality of life for affected individuals.
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