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1 Introduction Varicocele, a common vascular abnormality in men, has been increasingly recognized not just as a localized issue affecting venous return from the testis but as a condition that may have systemic implications on male reproductive health ( In the testicular microenvironment, venous congestion associated with varicocele leads to increased temperature, hypoxia, and accumulation of metabolic waste products ( Clinical evidence supporting a direct and robust causal relationship between varicocele and erectile dysfunction remains limited and inconsistent, with most available data derived from observational studies that show associations rather than causality Nonetheless, preclinical and mechanistic studies indicate that varicocele-induced oxidative stress and inflammatory cytokines can compromise endothelial function in the penile vasculature ( Moreover, preclinical investigations have highlighted the interplay between inflammation and the neurovascular components of the penis, suggesting that the inflammatory milieu can disrupt nerve function and induce apoptosis of cavernous nerve fibers in experimental settings ( In summary, the pathophysiology of varicocele extends beyond local testicular effects, encompassing a broader immune-inflammatory network that clearly influences spermatogenesis and may also influence erectile function, although the latter is supported predominantly by indirect and preclinical evidence

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However, the feasibility of using it to treat metabolic disorders and neurodegenerative diseases is currently under investigation in clinical trials (Liu Y