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The thing most men miss is that new ED in your forties is a vascular signal, not just a bedroom problem. I treat it the way I treat a borderline blood pressure reading, with bloods and a proper cardiovascular workup, then layer on the rest.
Erectile dysfunction affects approximately 40% of men aged 40, rising to around 70% by age 70 - making it one of the most common conditions in middle-aged men. Despite this prevalence, most men don't discuss it with a doctor for an average of two years after it starts affecting them.
This article won't lecture about seeing a GP - though that remains important. Instead, here's a clear-eyed breakdown of what actually causes ED, what the assessment should cover, and what the evidence supports for treatment.
What Erectile Dysfunction Actually Is
An erection requires the coordinated activity of vascular, neurological, hormonal, and psychological systems. Any significant impairment in one or more of these systems can cause erectile dysfunction.
The definition is consistent inability to achieve or maintain an erection sufficient for satisfactory sexual activity. Occasional difficulty - after poor sleep, excessive alcohol, or extreme stress - is normal and not erectile dysfunction. The clinical threshold is more than 25% of attempts being unsuccessful, or a persistent pattern.
The Vascular Cause: Why ED Is a Cardiovascular Warning Sign
The most important thing most men don't know: erectile dysfunction is frequently an early sign of systemic vascular disease.
The penile arteries are 1–2mm in diameter. The coronary arteries supplying the heart are 3–4mm. Atherosclerosis (plaque build-up in arterial walls) affects small arteries first. ED from impaired penile blood flow therefore typically precedes cardiac events by 3–5 years.
A 2003 study in The Lancet found that men presenting with ED had a significantly elevated risk of cardiovascular disease over the following 5 years, even after adjusting for traditional cardiovascular risk factors. Multiple subsequent meta-analyses have confirmed this relationship.
This means: New or worsening ED in a man over 40 warrants cardiovascular risk assessment - blood pressure, lipids, fasting glucose, hsCRP - regardless of whether the man has cardiac symptoms.
The Hormonal Cause: Testosterone and the Erection
Testosterone is required for libido (sex drive) and for the neurological signalling that initiates erection. Low testosterone reliably reduces libido, which reduces sexual arousal, which reduces erectile function.
However: testosterone alone doesn't cause most ED. The majority of men with ED have normal or near-normal testosterone. Testosterone deficiency is a cause to rule out - particularly in men with absent libido alongside ED, morning erection changes, or other low-T symptoms - but it's not the primary cause in the majority of cases.
The testosterone:oestradiol ratio also matters. Elevated oestradiol (from aromatisation, driven by higher body fat) is independently associated with erectile dysfunction even with adequate total testosterone.
The Neurological and Psychological Dimension
Nitric oxide (NO) is the primary mediator of the penile vascular response - it relaxes the smooth muscle of penile arteries, allowing blood inflow and erection. NO is released from both endothelial cells (in blood vessels) and neuronal cells (from the autonomic nervous system). Anything impairing NO production or signalling impairs erection.
Performance anxiety is the most common psychological cause. Once a man experiences failure, anticipatory anxiety about the next encounter creates sympathetic nervous system activation (fight-or-flight) that directly impairs the parasympathetic signals required for erection. This becomes a self-perpetuating cycle.
Depression and anxiety disorders are strongly associated with ED through both neurobiological pathways and reduced motivation/libido.
Assessment: What Investigations You Actually Need
A proper assessment of ED should include:
- Testosterone and oestradiol (free testosterone if SHBG is available)
- Full lipid panel (LDL, HDL, triglycerides)
- Fasting glucose and HbA1c (diabetes is one of the most common causes of vascular ED)
- Blood pressure (hypertension directly causes vascular ED)
- Prolactin (elevated prolactin suppresses testosterone and directly causes ED)
- Thyroid function (both hypo- and hyperthyroidism can cause ED)
- hsCRP (inflammatory marker)
- PSA (if considering testosterone therapy)
Most of these can be done through an at-home test or GP. Services like Lola Health cover the full hormonal panel. Pharmacy2U's online consultation pathway can provide assessment and prescribing for ED medications.
Treatment Options
PDE5 inhibitors (sildenafil, tadalafil, vardenafil):
These are the first-line medical treatment for ED, working by inhibiting phosphodiesterase-5 - an enzyme that breaks down cGMP, the signalling molecule that keeps penile smooth muscle relaxed. By inhibiting PDE5, these drugs extend the duration of the erection-facilitating state.
Sildenafil (Viagra) works within 30–60 minutes, effective for 4–6 hours. Tadalafil (Cialis) has a much longer duration (up to 36 hours), making it more practical for men who don't want to time medication precisely. Both are now available as generic medications at significantly lower cost than branded versions.
Important: These medications require sexual arousal to work - they don't cause erections without stimulation. They enhance the vascular response to arousal; they don't replace it.
These are available via private prescription in the UK, including through online consultation services like Pharmacy2U.
Lifestyle interventions (evidence-based):
A 2011 meta-analysis (Journal of Sexual Medicine) found that lifestyle modifications - weight loss in obese men, increased physical exercise, dietary improvement - significantly improved erectile function scores. Exercise alone, specifically aerobic exercise at 40 minutes, 4 times weekly, improved ED scores in men with metabolic syndrome or cardiovascular risk factors in multiple trials.
Testosterone replacement if testosterone is genuinely deficient (see the TRT guide elsewhere on this site). Testosterone restoration improves libido reliably and often improves erectile function as a downstream benefit, though it's not first-line treatment for ED in men with normal testosterone.
Pelvic floor training: Pelvic floor muscle exercises have evidence in the ED literature. A 2005 RCT found that pelvic floor exercises restored normal erectile function in 40% of men with ED and improved function in a further 33.5%, comparable to PDE5 inhibitor effects in some measures.
When to See a GP
ED warrants GP assessment when:
- It's persistent and affecting quality of life
- You're over 40 and it's a new development (cardiovascular investigation warranted)
- There's absent or reduced libido alongside ED (hormonal investigation warranted)
- PDE5 inhibitors aren't working (may indicate more significant vascular or neurological cause)
- You're taking medications that could be contributing (certain antidepressants, antihypertensives, antiandrogens all cause ED)
For routine assessment and prescription access, Pharmacy2U's online consultation is a practical pathway for men who want to address this efficiently without waiting for an in-person GP appointment.
Treat new or worsening ED in your 40s as a vascular and hormonal screen, not a stand-alone bedroom issue. Investigate blood pressure, lipids, glucose, testosterone and oestradiol first, then layer in PDE5 inhibitors, aerobic exercise and pelvic floor work as indicated.
This article is for educational purposes. ED can be a sign of underlying cardiovascular or hormonal conditions. Consult a GP or appropriate clinician for assessment.
