Erectile Dysfunction

Erectile dysfunction is a medical condition in which a man is unable to achieve or maintain sufficient firmness of the penis for intercourse. To qualify as a medical condition, the problem typically occurs repeatedly and persists over time, rather than happening once. Occasional erectile difficulty is a common experience for many men.

Erectile function depends on the coordination of nerves, blood vessels, and hormones. When the brain perceives sexual arousal, nerves signal the blood vessels in the penis to dilate, allowing blood to fill the spongy tissues (corpora cavernosa), which produces rigidity. Anything that disrupts one of these steps—nerve damage, vascular constriction, falling hormone levels, or psychological distress—can cause erectile dysfunction.

Causes

Causes are both physical and psychological, and often overlap. Physical causes include diabetes, hypertension, high cholesterol, and heart and vascular disease, since these damage small blood vessels. Smoking, excessive alcohol, and obesity or overweight increase risk. Neurological conditions such as multiple sclerosis, spinal cord injury, and cancer or radiotherapy of the prostate also contribute. Low testosterone and certain medications—including those for blood pressure, depression, and some pain relievers—are likewise implicated.

On the psychological side, sexual performance anxiety, depression, stress from life circumstances, fatigue, and relationship conflict play a significant role, especially in younger men. A common indicator of psychological causes is that erections still occur during sleep or upon waking, while they are absent during sexual situations.

Evaluation

Physicians typically begin with a medical history and questions about how the problem started, whether it occurred gradually or suddenly. Physical examination and blood tests are performed to check blood glucose, cholesterol, and hormone levels. Since erectile dysfunction often signals early heart and vascular disease not yet apparent clinically, general cardiovascular testing is an important part of evaluation.

Treatment

Treatment depends on the underlying cause. Lifestyle changes—quitting smoking, weight loss, exercise, and managing blood pressure and diabetes—are usually recommended first. Oral medications in a class called PDE5 inhibitors (such as sildenafil and tadalafil) are the most commonly used treatments; they work by improving blood flow, but cannot be used by those taking nitrate medications for heart conditions. Other options include penile injection therapy, vacuum devices, testosterone replacement when deficiency is confirmed, and surgical implants when other approaches fail. When the cause is psychological, counseling and behavioral therapy, sometimes with partner involvement, are employed.