What Causes Erectile Dysfunction—and How to Improve It

Erectile dysfunction (ED) refers to the persistent inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance. It is not simply occasional difficulty—rather, it is diagnosed when the problem occurs repeatedly over a period of several months and interferes with sexual activity or causes psychological distress.

ED can stem from a wide range of underlying causes, including vascular disorders (e.g., atherosclerosis, hypertension), metabolic conditions (such as diabetes mellitus and dyslipidemia), neurological impairments (e.g., multiple sclerosis, spinal cord injury), hormonal imbalances (notably low testosterone or hyperprolactinemia), pelvic surgery or trauma, and certain medications—including selective serotonin reuptake inhibitors (SSRIs), antihypertensives, and antipsychotics. Psychological factors—including anxiety, depression, relationship stress, and performance-related concerns—also contribute significantly, either independently or in combination with organic causes.

First-line management typically involves lifestyle modification: smoking cessation, regular aerobic exercise, weight optimization, moderation of alcohol intake, and treatment of comorbid conditions like hypertension and type 2 diabetes. Pharmacotherapy with phosphodiesterase type 5 (PDE5) inhibitors—such as sildenafil, tadalafil, vardenafil, and avanafil—is evidence-based, effective, and widely used. These agents enhance nitric oxide–mediated smooth muscle relaxation in the corpus cavernosum, facilitating erection in response to sexual stimulation.

For patients who do not respond to or cannot tolerate oral therapy, second-line options include intracavernosal injection therapy (e.g., alprostadil), intraurethral alprostadil, vacuum erection devices, and, in select cases, penile prosthesis implantation. Comprehensive evaluation—including detailed history, physical examination, and targeted laboratory testing (e.g., fasting glucose, lipid panel, morning total testosterone)—is essential before initiating treatment to identify reversible contributors and guide individualized care.