ED Cause Router
ED is a symptom, not a diagnosis. The same outcome can be driven by very different underlying problems, and the right path forward depends on which one is yours. This calculator looks at your specific symptom pattern and routes you toward the most likely cause.
What this is not: a severity score. There are other tools for that. What this is: a structured way to figure out whether your symptoms fit the hormonal pattern, the cardiovascular pattern, the psychogenic pattern, or some combination, so the next step you take is actually pointed at the problem.
The three main pathways
Real erections require four systems working together: hormones to drive desire and tissue health, vascular function to deliver blood, nerve signaling, and a brain that’s actually engaged. ED happens when one or more of these breaks down. The pattern of how it breaks down tells you where to look first.
The fuel ran out
Low testosterone, sometimes thyroid or prolactin issues. Hallmarks: low libido, fading morning erections, fatigue, gradual onset. The whole drive system is dimmed, not just the mechanics.
The plumbing is breaking down
Endothelial dysfunction, arterial stiffness, often part of broader cardiovascular disease. Hallmarks: libido intact, morning erections may still occur but weaker, gradual decline tied to age and metabolic risk factors. Often the canary in the coal mine for heart disease.
The signal stopped firing
Anxiety, depression, stress, relationship factors, performance anxiety. Hallmarks: sudden onset, situational (works alone or with one partner but not another), libido often intact, morning erections often preserved.
Most men over 50 with ED have some mix. The point of routing is to identify the dominant pattern so you fix that first and see what’s left, not to assume one cause and treat it in isolation.
Find your pattern
Answer based on what’s actually been happening, not what you wish were happening. The calculator is more useful the more honest you are.
One more question to narrow this down
Your symptoms fit more than one pattern closely. This last question helps point at the most likely one.
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What these percentages mean. These are not probabilities of having each cause. They’re a measure of how well your symptom pattern fits each known cause. ED is often multifactorial, especially after 50, and a high score in one bucket doesn’t rule out the others. The point is to identify the dominant pattern so you know where to start.
What’s pointing toward this pattern
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Psychogenic ED responds to treatment, often well. The right person to see is a clinical psychologist with experience in sexual health, or a sex therapist. We can\’t connect you with one directly, but it\’s a path worth taking seriously if this is your pattern.
For educational purposes only. This calculator produces a symptom-pattern estimate, not a diagnosis. ED can have multiple overlapping causes and may indicate underlying cardiovascular disease, hormonal dysfunction, or psychological factors that require clinical evaluation. A qualified physician should evaluate any new or worsening erectile dysfunction.
Why ED is sometimes the first warning sign of heart disease
The arteries that supply the penis are smaller than the coronary arteries that supply the heart. When endothelial function starts to fail, those smaller vessels usually go first. That’s why ED in a man over 40 with no obvious psychological cause is increasingly treated as a cardiovascular event waiting to happen. Multiple large studies have shown that men with new-onset ED have a measurably higher rate of heart attacks and strokes in the years following.
This is the single most important reason not to just chase a Viagra prescription and call it done. If your symptom pattern points cardiovascular, the right next step is to find out what’s actually going on with your lipids, your inflammation, your insulin sensitivity, and your blood pressure. ApoB and lipoprotein particle data tell you more than standard cholesterol panels and are usually not ordered at a routine physical.
How the routing works
Each question maps to one or more of the three pattern signatures. The strongest single signals:
- Morning erections. If you used to wake up with them and that has faded gradually, hormonal axis goes up. If they’re preserved, hormonal axis goes down and psychogenic goes up.
- Libido. Intact libido with bad mechanical performance points away from hormonal and toward vascular or psychogenic. Low libido points toward hormonal almost regardless of the mechanical picture.
- Onset pattern. Gradual decline over months or years is consistent with hormonal or vascular. Sudden onset, especially around a specific stressor, is the signature of psychogenic.
- Situational vs global. Works fine alone or with one partner but not another is almost diagnostic of psychogenic. Failure across all contexts points organic.
- PDE5 response. Viagra or Cialis works well: vascular pathway is intact. Doesn\’t work: could be very low testosterone or severe vascular disease. Either way, more investigation is needed.
- Cardiovascular risk factors. Hypertension, diabetes, high cholesterol, smoking, family history of heart disease all push the vascular score up.
What to do based on your dominant pattern
Hormonal pattern
Get a complete hormone panel. Total testosterone, free testosterone, SHBG, estradiol, prolactin, LH, FSH, TSH. Bring those numbers to a clinician who knows what to do with them. If testosterone is genuinely low, TRT is the most direct intervention and the one that resolves the broader cluster of symptoms beyond just ED. Most men with hormonal-pattern ED who address the testosterone see their libido return well before their mechanical function does.
Cardiovascular pattern
Get a metabolic and cardiovascular panel. ApoB, lipid particle profile, hsCRP, fasting insulin, HbA1c. Talk to your primary care doctor about your blood pressure. ED in the cardiovascular pattern is often the first detectable sign of broader endothelial dysfunction, and treating it as an isolated problem is missing the larger picture. PDE5 inhibitors may work in the short term while you address the underlying disease.
Psychogenic pattern
This one is usually highly treatable and often responds to therapy alone. A psychologist with experience in sexual health, ideally a CBT-trained sex therapist, is the right person to see. Performance anxiety responds especially well to brief targeted intervention. Don\’t skip this step assuming the answer is pharmacological. Many men in this bucket end up on medications they didn\’t need.
Mixed pattern (most men over 50)
Start with bloodwork, because it disambiguates the hormonal and cardiovascular questions in a way no quiz can. With actual data in hand, your real picture comes into focus and the right path forward becomes obvious. A full hormone and cardiometabolic panel runs $189 and answers a lot of these questions at once.
Common questions
Viagra works for me. Does that mean my problem is psychological?
Not necessarily. PDE5 inhibitors like Viagra and Cialis work downstream of most of the relevant biology, so they often produce an erection even when the underlying cause is hormonal, vascular, or psychological. What PDE5 responsiveness tells you is that the basic vascular plumbing is intact enough to function. It doesn\’t tell you the cause of your symptoms in everyday life. If you have low libido, no morning erections, and Viagra works, your pattern is still consistent with hormonal involvement.
I have no morning erections at all anymore. What does that mean?
Loss of morning erections is one of the more specific signals for hormonal involvement, though it can also happen in advanced vascular disease. Healthy testosterone supports the spontaneous nocturnal and early-morning erections that men get during REM sleep. When testosterone drops significantly, those quietly disappear. If you haven\’t had a morning erection in months, getting your hormones tested should be high on your list regardless of what else is happening.
My ED started after a specific stressful event. Is it permanent?
Almost certainly not, and this is the most treatable pattern of the three. Stress-triggered or anxiety-triggered ED responds well to therapy, sometimes within a few sessions of CBT focused on performance anxiety. The longer it goes untreated, though, the more layers of secondary anxiety build up around the original issue. Treating it early is meaningfully easier than treating it after months of avoidance.
Should I just try Viagra without doing all this investigation?
If you\’re using it to confirm that the basic vascular machinery still works, and you\’re combining that with actually finding out what\’s causing your symptoms, fine. If you\’re using it as a way to avoid finding out what\’s wrong, you may be missing a meaningful warning. ED at age 45 with no obvious cause is sometimes the first detectable sign of cardiovascular disease that will become a real heart attack in five to ten years. Skipping the workup to get the prescription is occasionally a costly choice.
Can low testosterone alone cause ED?
Yes, but it\’s more common for low testosterone to cause low libido that secondarily produces ED, rather than directly causing erectile failure. The classic hormonal-pattern presentation is: desire is gone, you don\’t initiate, when you do try the mechanics are weak. Pure mechanical ED with normal desire is more often vascular. Testosterone replacement in genuinely hypogonadal men typically restores libido first, then morning erections, then full erectile function over several months.
I have ED and high blood pressure. Are those connected?
Often yes, in two ways. Hypertension itself damages endothelial function over time and is one of the strongest predictors of vascular-pattern ED. And some blood pressure medications, particularly older beta-blockers and thiazide diuretics, can contribute directly to ED. If you\’re on one of those, talk to the prescriber about whether a different class might work for you. The newer ARBs and ACE inhibitors are generally more ED-neutral.
Stop guessing. Start with data.
ED has multiple possible causes, and each one has a different fix. The cheapest, fastest way to disambiguate is bloodwork. A complete panel tells you whether your testosterone is the problem, whether your cardiovascular markers are heading the wrong way, and gives you the foundation any honest clinician needs to make a real recommendation. From there, the path is concrete instead of guesswork.
If your pattern points strongly hormonal, a TRT consult is the most direct next step. If it points vascular, a primary care or cardiologist visit comes first. If it points psychogenic, a sex-positive therapist is the right person to see. Whichever path applies, real data makes it more useful.