Erectile Dysfunction: Causes and Treatment Options

Erectile dysfunction (ED) is the inability to achieve or maintain an erection firm enough for satisfactory sexual intercourse. It is more common than many men realize.

A 2004 survey in Thailand of men aged 40–70 found that about 43% experienced some degree of ED, ranging from occasional difficulty to complete inability to have intercourse.

How Erections Work — and Where They Can Fail

An erection depends on a coordinated sequence:

1. Initiation — signals from the brain, nerves, and hormones start the process.
2. Filling — arteries deliver increased blood flow into the corpora cavernosa.
3. Storage — veins restrict outflow so the blood stays trapped and creates firmness.

Problems at any of these stages can produce ED:

• Failure to initiate (psychological, neurological, or hormonal issues)
• Failure to fill (arterial problems)
• Failure to store (venous leak)

Main Causes

Studies indicate roughly:

• 70% organic (physical)
• 11% psychogenic (psychological)
• 18% mixed

Common physical causes include:

• Diabetes
• Atherosclerosis (hardening of the arteries)
• Cardiovascular disease and high blood pressure
• High cholesterol
• Thyroid disorders
• Spinal cord injury
• Pelvic or prostate surgery
• Radiation therapy
• Certain medications (some blood-pressure drugs, antidepressants, hormonal agents, etc.)

Psychological factors include:

• Stress
• Anxiety
• Depression
• Relationship concerns

Lifestyle contributors such as smoking, heavy alcohol use, obesity, and poor sleep also raise risk.

Diagnosis

Diagnosis is usually straightforward. A doctor will take a detailed medical and sexual history, perform a physical examination, and may order laboratory tests (blood sugar, hormones, lipids, etc.). Honest communication with the physician is essential for accurate assessment.

Treatment Options

Treatment has advanced significantly over the past two decades.

Earlier approaches

• Vacuum erection devices (with a constriction ring)
• Penile implants (surgical)
• Intracavernosal (penile) injections

These remain useful in selected cases, especially when oral medications are not suitable or effective.

Current first-line treatment
Oral phosphodiesterase type-5 (PDE-5) inhibitors such as:

• Sildenafil
• Tadalafil
• Vardenafil
• Avanafil

These medications improve blood flow into the penis and help many men achieve firmer, more reliable erections. They are generally taken on demand (or daily in low-dose form for some agents) and have a good safety profile when prescribed appropriately.

Additional options may include testosterone replacement (when levels are low), counseling for psychological factors, lifestyle changes (exercise, weight management, quitting smoking, moderating alcohol), and, in refractory cases, more advanced interventions.

Key Takeaway

Most cases of erectile dysfunction have identifiable physical or mixed causes and respond well to modern treatment. Early evaluation is preferable to prolonged self-management or unproven remedies. A urologist or sexual-medicine specialist can help determine the underlying factors and recommend the most suitable approach.