Erectile dysfunction (ED) is defined as the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual performance. It affects an estimated 150 million men worldwide, with prevalence increasing with age — though it is not an inevitable part of aging.
The Physiology of Erection
An erection is a complex neurovascular event. Sexual arousal triggers the brain to send signals through the nervous system to the penile arteries, causing them to relax and expand. Blood flows into the corpora cavernosa — two sponge-like chambers running the length of the penis — filling them and creating rigidity. A membrane called the tunica albuginea helps trap the blood, maintaining the erection.
Common Causes
Vascular causes are the most common, accounting for ~70% of ED cases. Conditions that impair blood flow — atherosclerosis, hypertension, high cholesterol, and diabetes — directly affect the penile arteries. In fact, ED is often considered an early warning sign of cardiovascular disease, as penile arteries are smaller and show damage before larger coronary arteries.
Neurological causes include spinal cord injuries, multiple sclerosis, Parkinson's disease, and nerve damage from prostate surgery. The nerve signals required for erection can be disrupted at any point between the brain and the penis.
Hormonal imbalances, particularly low testosterone (hypogonadism), can reduce libido and contribute to ED. Thyroid disorders and elevated prolactin levels can also play a role.
Psychological factors — including performance anxiety, depression, relationship stress, and past trauma — account for about 10-20% of ED cases, though they frequently coexist with physical causes.
The IIEF-5 Assessment
The International Index of Erectile Function (IIEF-5) is a validated 5-question self-report tool used by urologists worldwide to assess ED severity. Scores range from 5 to 25, with lower scores indicating more severe dysfunction. This is the same assessment used on SimplyMen to guide your personalized recommendations.
Modern Treatment Approaches
PDE5 inhibitors (Sildenafil, Tadalafil, Vardenafil) remain the first-line treatment, with 60-70% effectiveness. They work by enhancing the natural nitric oxide pathway, improving blood flow to the penis.
Lifestyle modifications are critically important and often underutilized. Regular aerobic exercise, weight management, smoking cessation, and limiting alcohol can improve erectile function by 30-40% — sometimes matching medication effectiveness.
Combination therapy — using supplements alongside lifestyle changes and, when appropriate, prescription medication — often yields the best outcomes.
When to See a Doctor
If ED persists for more than a few weeks, occurs with more than 50% of sexual attempts, or is accompanied by other symptoms like reduced libido, painful ejaculation, or difficulty urinating — consult a specialist. Early intervention leads to better outcomes.