A clear guide to erectile dysfunction, including symptoms, possible causes, health checks, treatment options and when to seek urgent help.
Erectile dysfunction (ED) means repeatedly being unable to get or keep an erection firm enough for satisfactory sexual activity. An occasional erection problem is common, particularly during stress, tiredness or after drinking a large amount of alcohol. If it keeps happening, it is worth arranging a medical assessment. ED can be treated, and in some men it is the first recognised sign of another health problem.
An erection begins with sexual stimulation. Signals from the brain and nerves cause smooth muscle in the penis to relax, allowing more blood to enter the erectile tissue. Veins are compressed as the penis becomes firm, helping to retain that blood. Problems with blood vessels, nerves, hormones, penile tissue or sexual arousal can disrupt this process.
ED may involve:
The problem may happen every time, only in particular situations or intermittently. A pattern that has continued or recurred is more clinically meaningful than one isolated occasion.
People often use “impotence” to describe several different concerns. Separating them helps identify the right assessment and treatment.
| Concern | What it means | How it differs from ED |
|---|---|---|
| Erectile dysfunction | Difficulty getting or maintaining an erection that is adequate for satisfactory sexual activity | The main problem is erection firmness or duration |
| Low libido | Reduced interest in or desire for sexual activity | A man may have low desire but normal erections when aroused, or ED with normal desire |
| Premature ejaculation | Ejaculation that occurs sooner than wanted, with difficulty delaying it | The main problem is control and timing of ejaculation |
| Delayed ejaculation | A marked delay in ejaculation or inability to ejaculate despite wanting to | An erection may remain normal |
| Infertility | Difficulty achieving a pregnancy | Fertility mainly concerns sperm and reproductive factors; normal erections do not guarantee fertility |
The central symptom is unreliable erection quality. Other information helps a clinician understand the pattern:
Preserved morning erections or erections during masturbation may suggest that situational or psychological factors are contributing, but they do not prove that the cause is purely psychological. Many men have a mixture of physical and psychological factors.
Blood-vessel problems are a common physical cause. The same factors that damage arteries elsewhere in the body can reduce blood flow to the penis, including smoking, high blood pressure, high cholesterol, diabetes, obesity and low physical activity. Nerve conditions, pelvic surgery or radiotherapy, penile conditions such as Peyronie’s disease, and clinically confirmed testosterone deficiency can also contribute.
Stress, performance anxiety, depression, relationship difficulties and previous distressing sexual experiences can affect arousal and erection quality. Anxiety may begin after a single episode and then make the problem recur. A physical cause can also create anxiety, so the categories are not mutually exclusive.
Some prescription medicines can affect erections or sexual desire. Examples include certain antidepressants, blood-pressure medicines and treatments that reduce androgen activity. Do not stop a prescribed medicine yourself. A clinician can assess the timing, the likelihood that the medicine is involved and whether an alternative is appropriate.
It can be a marker of cardiovascular or metabolic risk, but it does not mean that every man with ED has heart disease. The arteries supplying the penis are small, and impaired blood-vessel function may become apparent there before a man has recognised cardiovascular symptoms. Diabetes can affect both blood vessels and nerves and is strongly associated with ED.
The European Association of Urology (EAU) recommends assessment for cardiovascular and metabolic risk factors in men presenting with ED. In UK practice, NICE recommends QRISK3 for eligible adults without established cardiovascular disease; erectile dysfunction is one of the factors included in that tool. A review may therefore include blood pressure, smoking status, weight or waist measurement, cholesterol and a diabetes test.
Do not use ED as a way to diagnose heart disease yourself. Chest pain, marked breathlessness, fainting or palpitations with exertion or sexual activity need medical assessment. Sudden persistent chest pain or symptoms of a heart attack require a 999 call.
Arrange an assessment if erection problems keep happening, are causing distress or have changed without a clear short-lived explanation. It is particularly important to seek advice if:
A GP, sexual-health clinician or regulated online prescriber can start the assessment. Some men need referral to urology, endocrinology, cardiology or a psychosexual service.
The first appointment usually covers medical history, sexual symptoms, medicines, smoking, alcohol and recreational drugs, mental health and relationship context. Questions about morning erections, libido, ejaculation and orgasm are clinically relevant and should be handled confidentially.
An examination may include blood pressure, pulse, weight or waist measurement and, where indicated, examination of the genitals, pulses or signs of a hormone or neurological condition. The EAU advises checking glucose or HbA1c, lipids and an early-morning total testosterone level when these have not been assessed recently or are clinically indicated. Further hormone or specialist tests are selected according to the findings; most men do not need a penile scan.
Treatment is chosen according to the cause, safety, preferences and the effect on the man and his partner. It may include:
PDE5 inhibitors support the normal erection response; they do not create sexual desire and still require sexual stimulation. They must not be combined with nitrate medicines or recreational nitrites such as “poppers”, because the combination can cause a dangerous fall in blood pressure. A clinician or pharmacist should check heart health, other medicines and product-specific contraindications before treatment.
ED itself is not usually an emergency. Seek urgent help in the following situations:
They can be safe when supplied after an appropriate assessment by a regulated service and dispensed by a registered pharmacy. The NHS and MHRA warn that unregulated websites may sell falsified medicines with unreliable ingredients. Check Great Britain pharmacies on the General Pharmaceutical Council register and Northern Ireland pharmacies on the Pharmaceutical Society of Northern Ireland register, and make sure the clinical service and prescriber are appropriately regulated.
