Mastering Medical
USMLE Step 1 · Reproductive

Psychogenic erectile dysfunction vs Organic erectile dysfunction

How to tell Psychogenic erectile dysfunction and Organic erectile dysfunction apart when a board question makes them look alike.

Fastest separator

Psychogenic ED is situational with preserved nocturnal erections; organic ED is persistent with lost nocturnal erections or medical risk factors.

Side by side

Psychogenic erectile dysfunctionOrganic erectile dysfunction
Key clue

Psychogenic ED has sudden onset, situational pattern, preserved nocturnal or morning erections, and relationship or performance anxiety context.

Organic ED has gradual onset, persistent pattern, reduced nocturnal erections, and vascular, neurologic, endocrine, medication, or substance risk factors.

Mechanism

Psychogenic ED reflects central performance, mood, stress, or relationship factors interfering with arousal despite intact physiology.

Organic ED reflects impaired arterial inflow, venous trapping, nerve signaling, testosterone state, or medication effects.

Labs and tests

Normal nocturnal tumescence and situational function support psychogenic ED.

Diabetes, vascular disease, pelvic surgery, low testosterone, hyperprolactinemia, or abnormal nocturnal tumescence support organic ED.

The trap

ED is a symptom, not a diagnosis; timing and nocturnal erections separate psychogenic from organic patterns.

The repair move

For ED, ask about nocturnal erections, onset tempo, situational pattern, and vascular or endocrine risks.

Try a free question

Core

A 32-year-old man has had 8 months of inability to maintain erection during partnered intercourse with his new partner. He reports normal morning erections, normal erections during masturbation, and increased work-related stress. Vital signs and physical exam are normal. Which diagnosis is most likely?

Show answer and explanation

Answer: A. Psychogenic erectile dysfunction. Psychogenic ED has sudden onset, situational pattern, preserved nocturnal/morning erections, and is often linked to relationship issues or performance anxiety; treatment is psychotherapy and PDE5 inhibitors as adjuncts.

Why the other choices are tempting

  • B. Organic vascular ED has gradual onset, persistent pattern (including loss of nocturnal erections), and vascular risk factors.
  • C. Neurologic ED is associated with diabetes, pelvic surgery, or spinal cord disease with persistent symptoms.
  • D. Hypogonadism has low libido, fatigue, and low testosterone, not preserved morning erections.
  • E. Peyronie disease causes penile curvature from fibrous plaques, not isolated inability to maintain erection.

Flashcards

Tap a card to flip it.

What finding supports psychogenic ED?

Preserved nocturnal or morning erections support psychogenic ED.

What onset supports organic ED?

Gradual persistent onset supports organic ED.

Quick answers

What is the fastest way to tell Psychogenic erectile dysfunction from Organic erectile dysfunction?

Psychogenic ED is situational with preserved nocturnal erections; organic ED is persistent with lost nocturnal erections or medical risk factors.

What is the key clue for Psychogenic erectile dysfunction?

Psychogenic ED has sudden onset, situational pattern, preserved nocturnal or morning erections, and relationship or performance anxiety context.

What is the key clue for Organic erectile dysfunction?

Organic ED has gradual onset, persistent pattern, reduced nocturnal erections, and vascular, neurologic, endocrine, medication, or substance risk factors.

What is the common trap with Psychogenic erectile dysfunction vs Organic erectile dysfunction?

ED is a symptom, not a diagnosis; timing and nocturnal erections separate psychogenic from organic patterns.