How to Know If You Have Erectile Dysfunction: Symptoms, Diagnosis and Next Steps

The inability to achieve or maintain an erection firm enough for satisfactory sexual activity is known as erectile dysfunction (ED). But how do you know if what you are experiencing is genuinely ED — or simply a normal, occasional variation in sexual performance? This guide explains the signs and symptoms of erectile dysfunction, how it is diagnosed, and what to do next.

What Is and Isn’t Erectile Dysfunction?

Occasional difficulty getting or maintaining an erection is entirely normal. Stress, tiredness, alcohol, illness, and relationship tension can all cause temporary difficulties that resolve without any intervention. These isolated incidents are not erectile dysfunction.

ED becomes a clinical concern when:

• It 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 significant distress, anxiety, or affecting your relationships or quality of life
• It is accompanied by other symptoms that may suggest an underlying health condition (reduced libido, fatigue, unexplained weight change)

Signs and Symptoms of Erectile Dysfunction

Primary erectile symptoms:

• Inability to achieve an erection despite sexual stimulation — the penis does not become erect at all
• Insufficient firmness — an erection develops but is not firm enough for penetration
• Loss of erection before or during sexual activity — the erection subsides before or immediately after penetration

Associated symptoms that may indicate an underlying cause:

• Reduced sexual desire (low libido) — often associated with hormonal causes (low testosterone, thyroid disorders)
• Changes in ejaculation — premature or delayed ejaculation can be associated with ED, particularly in anxiety-driven cases
• Anxiety and avoidance — actively avoiding sexual situations because of fear of failure; this is both a symptom and a maintaining factor
• Relationship strain — conflict, withdrawal, or communication difficulties around intimacy

Is It ED or Something Else?

Reduced Libido (Low Sex Drive)

A reduction in sexual desire (libido) is distinct from erectile dysfunction. A man with low libido may not initiate sexual activity or feel arousal, but when arousal does occur, erections may still function normally. A man with ED typically has normal or near-normal sexual desire but struggles with the physical erection response. Both can occur together — particularly when hormonal causes (low testosterone) or depression are involved.

Ejaculation Problems

Premature ejaculation (PE) and ED are different conditions. PE occurs when ejaculation happens very quickly during sex — with or without full erection. However, performance anxiety can cause both: a man anxious about losing his erection may rush to ejaculate, creating a co-presentation of anxiety, ED, and PE.

Nocturnal and Morning Erections

Healthy men typically have 3–5 nocturnal erections during sleep. If you consistently have morning erections or nocturnal erections (even when ED occurs during partnered sex), this suggests the physical mechanism is intact and a psychological cause — most likely performance anxiety — is the dominant factor. If morning and nocturnal erections are also absent, a physical cause is more likely.

What Causes ED?

ED can arise from physical causes (cardiovascular disease, diabetes, high blood pressure, hormonal conditions, nerve damage), psychological causes (anxiety, depression, stress, relationship difficulties), medication side effects, or — most commonly — a combination of physical and psychological factors that interact and reinforce each other.

For a comprehensive breakdown of all causes, see: What Causes Erectile Dysfunction?

How Is Erectile Dysfunction Diagnosed?

Clinical History

A prescriber or GP will ask about the nature, onset, frequency, and severity of your symptoms. They will also ask about your general health, cardiovascular risk factors, current medications, and lifestyle (smoking, alcohol, exercise, stress). They may use a validated questionnaire such as the International Index of Erectile Function (IIEF) to assess symptom severity objectively.

Blood Tests

Standard ED investigations include testosterone levels (morning sample preferred — testosterone follows a circadian rhythm), fasting blood glucose or HbA1c (diabetes screening), lipid profile (cholesterol), thyroid function tests, and full blood count.

Blood Pressure

Blood pressure assessment is standard in ED evaluation — hypertension is a significant risk factor and is also relevant to the choice of treatment.

Physical Examination

May include assessment of genital anatomy, cardiovascular health, and — in men with risk factors for prostate disease — a rectal examination.

When to Seek Help

Seek assessment from a doctor or prescriber if ED has been consistently present for more than 2–4 weeks, it is causing distress or affecting your quality of life or relationships, you have underlying health conditions (diabetes, high blood pressure, heart disease), ED began after starting a new medication, or you are under 40 — a thorough assessment is particularly important in younger men.

You do not need to visit a GP in person. Access Doctor’s GPhC-registered pharmacist independent prescribers can assess your ED symptoms via a confidential online consultation and prescribe appropriate treatment quickly and discreetly.

For information on treatment options, see: Understanding and Overcoming Erectile Dysfunction.