By symptom

Erectile dysfunction.

ED is the canary. The body is telling you something about vascular and hormonal health.

What’s actually going on

How I think about this.

Erectile dysfunction is often more informative than it is treated as. A PDE5 inhibitor can relieve the symptom, and it is also worth asking what the symptom is signalling.

ED is a downstream signal from the vascular system, the hormonal system, the metabolic system, and the nervous system, working together or not. Erectile tissue is some of the most flow-sensitive tissue in the body. When ApoB is high, insulin is resistant, testosterone is low, blood pressure is elevated, or inflammation is up, this tissue is often the first place it shows. A 45-year-old man with new ED has a different cardiovascular risk profile than a 45-year-old man without it, regardless of his cholesterol panel.

The right read is to treat ED as the diagnostic event it is. Run the full cardiometabolic and hormonal workup, identify what is actually driving the presentation, and treat the system. The PDE5 prescription can still be part of the plan. It is the band-aid, not the strategy.

Before anything else

When erectile dysfunction needs medical evaluation.

Everything further down this page is about physiology that can contribute to this symptom. None of it replaces a conventional diagnosis, and some presentations need to be seen rather than measured. Start here.

Get emergency care now

An erection lasting more than four hours. This is priapism and needs emergency treatment to avoid permanent damage
Chest pain or breathlessness on exertion

If any of these apply, this page is not the right next step. Call 911 or go to an emergency department.

See a physician promptly, within days

New erectile dysfunction, which warrants cardiovascular risk assessment. It commonly precedes a cardiac event by two to five years and is one of the more useful early warnings in men's health
Erectile dysfunction with loss of morning erections, reduced body hair, or shrinking testicles
Onset with headache, visual change or milky nipple discharge
Onset after pelvic surgery, radiation or trauma

Worth a routine medical evaluation

Symptoms present for more than three months
Onset within weeks of a new medication
Symptoms alongside low mood or significant stress

Because this is a vascular signal first, the right first move is a cardiometabolic assessment rather than a hormone panel. That is a coherent measurement pathway and a genuinely useful one.

This list covers the presentations that most often need conventional assessment. It is not exhaustive, and it does not replace clinical judgement. If something feels wrong and is not on it, that is still a reason to be seen.

Systems that can contribute

Where erectile dysfunction can come from.

Each of these can be part of the picture. None of them is the answer on its own, and finding something here does not establish that it is the reason you feel the way you do.

Vascular function
The penile arteries are small, and endothelial dysfunction commonly shows there before it shows anywhere else. This is why erectile dysfunction is treated clinically as a cardiovascular warning sign rather than only a sexual complaint.
Metabolic regulation
Insulin resistance and diabetes are strongly associated, and often present before diagnosis.
Sex hormones
Testosterone contributes to desire more than to the mechanics, and low testosterone alone is a less common explanation than is often assumed.
Autonomic and neurological signalling
Nerve supply matters, and can be affected by diabetes, pelvic surgery or spinal problems.
Medication effects
Antihypertensives, antidepressants and several other classes are common contributors.
Psychological factors
Performance anxiety and depression are frequent, particularly when the onset was sudden or situational.

The physician’s lens

How I read this in practice.

I read ED across cardiovascular and hormonal axes together. ApoB, Lp(a), hsCRP, fasting insulin, HbA1c. Total and free testosterone with SHBG, estradiol, the full thyroid panel, prolactin when warranted. Blood pressure measured properly across multiple days. Sleep quality and architecture. The medication list, because more prescriptions affect erectile function than most patients realize. The metabolomic panel adds the nutrient and oxidative-stress story underneath all of it.

The systems behind it

Where this symptom comes from.

Most cases touch more than one. Open each area to read the biology underneath.

Biological pillars

Specialty practice areas

Specialty
Hormones
Start with the hormone signature tool. The hormone network is read as one system, in context, inside ongoing care.
Read this specialty

What measurement settles

What testing can and cannot tell you here.

Testing can help identify

Measure the cardiometabolic risk picture this symptom points at, including apoB, Lp(a), glucose and insulin
Measure testosterone properly, with binding proteins

Testing cannot by itself establish

Show whether you have coronary plaque, which requires imaging
Distinguish psychological from physical causes, which history does better
Determine whether treatment is appropriate or safe alongside your other medications

What may help clarify it

The data that explains it.

ED needs the cardiovascular panel, the full hormone read with binding proteins, and the metabolic axis in one draw. Treating it as anything less is treating the symptom and missing the diagnostic information your body is giving you.

While you wait

Moves worth making before testing.

These are the levers I’d pull while we set up the workup. Most of them produce real signal inside two weeks.

Lift heavy two to three times a week. Resistance training improves both the hormonal and vascular drivers.
Sleep seven to nine hours with a fixed wake time. Testosterone is made overnight; sleep loss collapses it.
Cut alcohol for two weeks. The vascular response shows up quickly.
Bring your medication list to the call. Several common prescriptions affect erectile function in ways the prescribing physician often doesn’t mention.

If two weeks of the basics doesn’t move the needle, that is the kind of presentation a call with me exists for. Your biology is telling you something the lifestyle layer cannot fix on its own.

Your next step

Measure it, then decide.

There is a coherent measurement pathway here. What a panel does not include is someone reading it against your history, and that reading is where care with me begins.

Learn for free

Explore working with Dr. Tagge

Go one level deeper.

How I think: The framework: how a symptom, a result and a history are read together, and why a reference range is not the same as a person’s range.
The systems: Mitochondria & Cellular Energy · Metabolism & Metabolomics · Chronobiology

Essays on this

All essays

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