Erections and heart disease: the same arteries, smaller

This is the most clinically useful thing about erectile dysfunction, and the least discussed: it is frequently the first symptom of a process that will later present as a heart attack.

The anatomy argument

Atherosclerosis is a systemic process. It does not choose one artery.

But it produces symptoms first wherever the margin is smallest, and that is a function of vessel diameter:

A given degree of narrowing reduces flow in a 1 mm artery long before it does in a 4 mm one. So the erection fails while the heart is still coping.

The interval

British Society for Sexual Medicine guidance describes erectile dysfunction as a sentinel marker for future cardiovascular events, typically occurring 3 to 5 years before an event, and notes it is particularly informative in men aged 40 to 49 ^[1].

Their headline statement is worth quoting directly:

A man with ED and no cardiac symptoms is a cardiac patient until proven otherwise. ^[1]

That figure comes from observational cohorts summarised in a guideline rather than from a randomised trial, so it is a reported typical interval rather than a prediction about any individual. But the direction is consistent and it is the basis of UK practice.

What should happen next

Not a prescription on its own. UK guidance recommends that every man presenting with erectile dysfunction has ^[1]:

• Fasting glucose and/or HbA1c
• Lipid profile
• Morning testosterone
• Blood pressure, heart rate and waist circumference

Together with an overall cardiovascular risk assessment. In the UK that is calculated using QRISK ^[3], which combines age, sex, ethnicity, blood pressure, cholesterol, smoking, diabetes, family history, BMI and other factors.

A note for anyone reading American material: US consensus guidance from 2024 recommends treating ED as a risk-enhancing factor and considering coronary artery calcium scoring. That is not UK practice, is not routinely NHS-commissioned for this indication, and UK risk assessment uses QRISK rather than the US equations.

Risk stratification and sex

Guidance uses a three-band approach ^[1]:

Low risk — controlled hypertension, asymptomatic with few risk factors, mild valve disease, successful revascularisation. Manage in primary care; sexual activity is fine.

Intermediate risk — further cardiac evaluation before reclassifying.

High risk — severe or unstable angina, uncontrolled hypertension, very recent heart attack. Defer both ED treatment and sexual activity pending cardiac assessment.

A practical threshold used in the product information for pharmacy-supplied ED medicines: if you become very breathless or get chest pain walking briskly for 20 minutes or climbing two flights of stairs, see a doctor before using them.

The reframe worth making

If you have gone to the trouble of seeking help for erectile difficulty, you have already done the hard part. The additional cost of a blood pressure reading, an HbA1c and a cholesterol test at the same appointment is close to zero, and it is the part that might matter most.

Treating the symptom without checking is a missed opportunity that is very easy to miss.

When to speak to a clinician

See a GP if you have:

• erectile difficulties lasting more than a few weeks, particularly with gradual onset
• ED alongside any chest discomfort, breathlessness on exertion, or pain in the calves when walking
• ED and have not had blood pressure, cholesterol or blood glucose checked in the last few years
• ED and a family history of early heart disease or stroke
• ED and diabetes, where assessment should be part of routine review

Seek emergency help for chest pain at rest, chest pain with sweating or nausea, or sudden severe breathlessness. Call 999.

This article is for general information and isn’t a substitute for advice from your own clinician. If you feel unwell, contact your GP or NHS 111. In an emergency, call 999.