Thyroid Hormones and It's Effects on Sexual Health of Males and Females

Thyroid hormones play a crucial role in regulating numerous physiological processes, yet their impact on reproductive and sexual health is often underestimated. Recent research suggests that imbalances in thyroid function-whether due to hypothyroidism or hyperthyroidism-can negatively affect the hypothalamic-pituitary-gonadal (HPG) axis, resulting in altered sex hormone levels, impaired gamete development, and reduced libido in both males and females. This article reviews recent clinical and experimental data to examine how thyroid imbalances contribute to infertility and sexual dysfunction, which affect millions worldwide. In men, thyroid dysfunction is frequently linked to lower testosterone levels, reduced sperm production, erectile difficulties, and issues with ejaculation. In women, thyroid hormone imbalances influence the development of ovarian follicles, menstrual cycle consistency, the receptivity of the endometrium, and pregnancy outcomes. Autoimmune thyroid conditions like Hashimoto’s thyroiditis and Graves’ disease add further complexity, particularly in women undergoing assisted reproductive treatments (ART). Fortunately, many of these reproductive and sexual symptoms can be reversed with timely correction of thyroid hormone levels, highlighting the importance of early diagnosis and management. In addition to their traditional hormonal roles, thyroid hormones act through both genomic and non-genomic pathways in reproductive tissues and interact with other hormonal signals such as leptin, prolactin, and insulin-like growth factors. These mechanisms offer potential pathways for developing novel diagnostic and treatment approaches. By integrating insights from both endocrinology and reproductive medicine, this review emphasizes the importance of evaluating thyroid function in individuals experiencing infertility or