What is the mechanism behind erectile dysfunction in diabetes?

• A. Endothelial dysfunction and autonomic neuropathy
• B. Hypogonadism
• C. Pelvic floor weakness
• D. Vascular compression

Answer: (A)

In diabetes, erectile function is mostly lost because chronic high blood sugar harms the blood vessels and nerves that control an erection. The endothelium lining penile vessels becomes dysfunctional, which lowers nitric oxide availability and impairs the smooth muscle relaxation needed for adequate penile blood flow and rigidity. At the same time, diabetic autonomic neuropathy damages the neural signals that initiate and sustain an erection, especially the parasympathetic input that promotes vasodilation and blood filling of the penis. This combo—reduced NO-mediated vasodilation and impaired autonomic nerve function—disrupts the vascular-neural system required for an erection, making erectile dysfunction a common complication of diabetes. Other factors like hypogonadism can contribute but are not the primary mechanism in most diabetic cases.