ED: The Basics — Erectile Dysfunction Explained

Erectile dysfunction (ED) — sometimes called impotence — is the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual intercourse. It is one of the most common men’s health concerns in the UK, affecting an estimated one in five men at some point in their lives. Despite how common it is, many men feel reluctant to seek help. This guide explains what ED is, how erections work, what causes the problem, and where to find effective, MHRA-approved treatment.

What Is Erectile Dysfunction?

Erectile dysfunction is defined as the persistent inability to get and keep an erection firm enough for sex. The key word is persistent — having one difficult experience is not ED. It becomes a clinical concern when it happens regularly, causes distress, or starts affecting your relationships or quality of life.

Occasional difficulties are normal. Stress, tiredness, alcohol, and relationship tension can all cause a temporary erection problem that resolves on its own. These isolated incidents are not erectile dysfunction.

Consider seeking help if:

• ED occurs more than half the time when you attempt sexual activity
• It has been present consistently for more than 2–4 weeks
• It is causing you significant distress, anxiety, or affecting your relationship
• You have underlying health conditions such as diabetes, high blood pressure, or heart disease — in which case early assessment is particularly important

How Does an Erection Work?

For an erection to occur, a coordinated sequence of events must happen in the right order:

1. Sexual stimulation (physical or psychological) triggers nerve signals in the brain and spinal cord
2. Nitric oxide is released in the penis, causing smooth muscle in the penile arteries to relax
3. Relaxed arteries widen, allowing blood to rush into the two spongy chambers of the penis (the corpus cavernosum)
4. The chambers fill and expand, creating the firm, erect penis
5. When stimulation ends, the process reverses and the erection subsides

Erectile dysfunction can occur when this process is disrupted at any stage — whether due to impaired blood flow, nerve damage, hormonal imbalance, or psychological factors.

How Common Is ED?

ED is far more common than most men realise. It affects approximately one in five men in the UK at some point in their lives. It is most common in men over 40 but affects men of all ages — research from the University of Wisconsin found that over 26% of men under 40 experience some form of ED. Despite its prevalence, many men suffer in silence: a 2020 European Association of Urology survey found that 26% of men who had experienced ED had not discussed it with anyone.

What Causes Erectile Dysfunction?

ED has many potential causes, broadly divided into physical, psychological, and medication-related:

Physical causes include cardiovascular disease, diabetes, high blood pressure, high cholesterol, obesity, hormonal imbalances (particularly low testosterone), neurological conditions (Parkinson’s, multiple sclerosis, spinal cord injury), and the effects of surgery — particularly prostate surgery.

Psychological causes include performance anxiety, depression, stress, relationship difficulties, and past sexual trauma. Psychological causes are particularly common in younger men.

Medication-related causes include certain antidepressants (SSRIs), beta-blockers, diuretics, and anti-androgen medications, all of which can contribute to ED as a side effect.

In many men, physical and psychological causes overlap — for example, a vascular problem causes occasional difficulty, which then triggers performance anxiety, which compounds the original problem.

What Treatments Are Available?

The four MHRA-approved oral medications for ED are all phosphodiesterase type 5 (PDE5) inhibitors. They work by increasing blood flow to the penis when sexually stimulated.

All four require sexual stimulation to work — they enhance the body’s natural response to arousal rather than bypassing it. For a full comparison, see our guide to Viagra vs Cialis vs Levitra vs Stendra.

Non-medication approaches — including lifestyle changes, psychological therapy, and pelvic floor exercises — are also effective, particularly for men with lifestyle-related or psychologically-driven ED. See: Lifestyle Changes for Erectile Dysfunction.

When to Seek Help

See a doctor or prescriber if ED has been present for more than a few weeks, if you have cardiovascular risk factors (diabetes, high blood pressure, heart disease), if ED began after starting a new medication, or if you are under 40 — a thorough assessment is especially important in younger men, as ED can occasionally signal an underlying health condition.

For a comprehensive guide to diagnosis, treatment options, and overcoming ED, see: Understanding and Overcoming Erectile Dysfunction.

See also: what causes erectile dysfunction.

See also: signs and symptoms of ED.