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5 September 2025The Relationship Between Diabetes and Erectile Dysfunction
Studies have shown that men with diabetes are 3.5 times more likely to experience erectile dysfunction compared to those without the condition. Advancing age, longer duration of diabetes, and poor blood sugar control are all factors that further increase this risk.
The Impact of Diabetes on Blood Vessels and Erectile Function
Why, then, is erectile dysfunction so common in diabetic patients? Diabetes is a disease that affects both large and small blood vessels throughout the body. Just as it damages the vessels supplying the eyes—leading to retinopathy and vision problems—or the tiny blood vessels in the kidneys—causing nephropathy and impaired filtration function—it can also affect the vessels that supply blood to the penis. This reduced penile blood flow damages the erectile tissue and, as a result, leads to the loss of the ability of the penis to relax adequately for an erection.
It is important to note that erectile dysfunction is not only seen in patients with a confirmed diagnosis of diabetes. In fact, nearly one in five men who present to us solely with erectile dysfunction are later found to have undiagnosed (hidden) diabetes. For this reason, in younger adult patients presenting with such complaints, it is not sufficient to measure only fasting blood glucose levels. Additional tests—such as insulin levels, HbA1c (three-month average blood glucose), and postprandial blood glucose—should also be performed to detect latent diabetes.
Early detection is crucial: if hidden diabetes is identified, simple lifestyle modifications can both prevent progression to overt diabetes and resolve erectile dysfunction before it worsens.
