Viagra vs sildenafil: What’s the difference between the...
Reviewed by Dr. Anup Jethwa
Yes, anxiety can cause erectile dysfunction (ED), and psychological factors are thought to play a large part in ED in younger men.
Worry switches on the body's stress response, which works against the relaxed blood flow an erection needs.
There are well-studied ways to help: Understanding what is happening, talking therapy (CBT in particular), small lifestyle changes and, for some men, prescription treatment.
Guidelines recommend combining therapy with medication where suitable.
A basic health check is still worth having first, because physical causes are common and can exist alongside anxiety.
It often starts with a single night.
Maybe it was a new partner, a few drinks too many, or a week of pressure at work. The erection did not go to plan, and it stuck in your mind. The next time, the worry arrived before anything else did.
Performance anxiety is a common issue in men with ED, and it is well described in the medical literature. If this sounds familiar, you are in good company, and there are clear routes forward.
This article covers what is happening in your body, how to tell anxiety-related ED from a physical cause, and what helps.
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It can. Anxiety is a real, physical cause of erection problems, not "just in your head".
An erection needs two things at once.
You have to feel aroused, and your body has to be relaxed enough to let blood flow into the penis.
At rest, the muscle in the walls of the penis's blood vessels stays contracted, and one of the main chemicals holding it tight is noradrenaline (similar to adrenaline).
During arousal, other signals override this: The muscle relaxes, and blood flows in and is held there.
Anxiety switches on the body's "fight or flight" response, which releases stress chemicals, including noradrenaline.
A review in Nature Reviews Disease Primers calls noradrenaline the primary anti-erectile chemical, and describes psychogenic ED as "adrenaline-mediated" for this reason.
In plain terms, stress can push the body towards the state that works against an erection.
The same review is candid that this type of ED "has not been well studied", so the exact mechanism in any one man is not fully mapped out.
Did you know?
The word "psychogenic" simply means the trigger starts in the mind. The erection problem itself is still a real physical response.
Erection problems affect a considerable proportion of men at least occasionally, according to the same review. A one-off night is not a diagnosis.
The trouble starts when that night becomes something you brace for. Men and clinicians describe a similar loop:
The Nature Reviews primer describes this pattern directly: Anxiety increases a man's focus on the firmness of his erection, leading to self-consciousness and distraction, and men who lose an erection this way tend to develop greater fears before the next encounter.
The third step has a name.
Sex researchers Masters and Johnson described a "spectator role" in their 1970 book Human Sexual Inadequacy, and the term spectatoring has stuck.
It means part of your mind steps outside the moment and starts watching and judging your performance, like a spectator in the stands.
Arousal needs your attention, and spectatoring takes it away.
A survey study in the Archives of Sexual Behavior linked worries about penis appearance to sexual difficulties through spectatoring.
The authors also tested whether anxious and easily distracted personality traits strengthen those links, and their hypotheses were partly supported.
Here’s the good part
Because the loop runs on worry and attention, it can be tackled from more than one direction. Understanding it, working on the worry, moving your focus back to sensation and, for some men, using medication alongside therapy can each help.
More common than most men expect. ED is often thought of as an age-related problem, but younger men are affected too.
The studies below looked at different things in different groups of men, so read each row on its own rather than comparing across rows.
| Study | Who was studied | What it found |
|---|---|---|
| Capogrosso et al., 2013 | 439 men with newly developed ED at one Italian clinic | 114 (26%) were aged 40 or under. Nearly half of the younger men (48.8%) had severe ED, similar to older men |
| Papagiannopoulos et al., 2015 | Review of studies of young men with ED | Psychogenic ED was more common in younger men, but at least 15 to 20% had a physical cause (individual studies ranged from 15% to 72%) |
| Velurajah et al., 2021 | 12 studies of men with anxiety disorders such as panic disorder, OCD and PTSD | Median ED prevalence of 20% (about 1 in 5), ranging from 0 to 85% across studies. |
| Morcos et al., 2026 | 535 men aged 18 to 40 with ED at one hospital in Ottawa | 15.1% had a mental health condition. Of those, fewer than 3 in 10 had been referred to psychiatry and around 1 in 7 to psychology |
Two of these are single-centre studies, so they show what one clinic or hospital saw rather than the whole population.
The balance between psychological and physical causes is debated, and it changes with the age group and the study.
The Nature Reviews primer says current evidence suggests more than 80% of ED overall has an organic (physical) cause, yet it also says most cases in younger men are likely to have a psychogenic basis.
That is why a check-up matters even when nerves look like the obvious explanation.
No single test says "this is anxiety". Most cases have more than one cause, so guidelines from the European Association of Urology (EAU) use the terms "primary psychogenic" and "primary organic" rather than a strict either/or. The Nature Reviews primer lists some clues doctors use.
Signs that point more towards anxiety or another psychological cause:
Signs that point more towards a physical cause:
These are clues, not proof. Many men have a mix of both.
Quick tip
Spend a couple of weeks noticing three things: Whether you wake up with erections, whether it is different on your own versus with a partner, and when it started. It gives a prescriber a much clearer picture, and many men find the pattern reassuring in itself.
Yes.
British Society for Sexual Medicine (BSSM) guidance is clear that all men with ED should have a history, examination, and investigations, even when a psychological cause is suspected.
Its guidelines say fasting glucose, a lipid profile, and a morning testosterone level should be considered mandatory in newly presenting patients.
EAU guidance adds a blood pressure check, and BSSM's practical guide adds a review of your current medicines.
The reason is simple.
ED can be an early sign of other health problems.
The Nature Reviews primer describes ED as a harbinger of coronary heart disease, and BSSM guidance notes it can appear around 3 to 5 years before a cardiovascular event.
Diabetes, heart disease and low testosterone are all far easier to manage when caught early.
A prescriber may want to check:
See a doctor first
See your GP in person, rather than starting treatment online, if you:
Not sure whether it is worth seeing a doctor? Our guide to when to see a doctor about ED walks through it.
For many men, the longest-lasting change comes from working on the worry itself.
Cognitive behavioural therapy (CBT) helps you spot anxious thoughts ("it's going to happen again") and challenge them, with practical steps to reduce pressure during intimacy.
EAU guidelines carry a strong recommendation to direct men to CBT, including the partner where possible, combined with medical treatment to maximise outcomes.
The research behind combining approaches is encouraging but still limited:
Psychosexual therapy is a specialist form of talking therapy. Therapists often use sensate focus, an approach that goes back to Masters and Johnson: Couples take intercourse off the table for a while and rediscover touch without any performance goal.
Mindfulness trains you to bring your attention back to what you can feel, rather than what you are worrying about, which is a natural fit for spectatoring.
The evidence is early.
A small Canadian pilot of a four-week group programme for men with situational ED found improvements in self-reported erectile function and satisfaction.
Think of mindfulness as a useful tool alongside other support, not a stand-alone fix.
Here’s the good part
You do not need a partner to benefit, and you do not need a "problem" in your relationship. Many men see a therapist on their own simply to feel calmer and more confident.
There is no rush and no single right path. Most men find it helps to take one small step:
Many men find that once they understand what is happening and the pressure comes off, their confidence starts to return. The research on combining therapy with medication is encouraging, and there are options if one approach does not suit you.
For many men, they can.
It may seem odd to use a medicine for a problem that starts with worry, but the Nature Reviews primer notes that men with psychological stressors such as performance anxiety may benefit from "confidence restoration" with erection medicines and/or counselling.
PDE5 inhibitors help blood flow into the penis when you are sexually aroused.
They do not cause an erection on their own, and they do not increase desire.
A couple of good experiences can quieten the "what if" voice. Guidelines suggest pairing medication with therapy rather than relying on tablets alone.
Four PDE5 inhibitors are approved for ED in Europe:
A 2009 meta-analysis of 130 randomised trials, mostly lasting 12 weeks or less, found PDE5 inhibitors led to successful intercourse attempts about 69% of the time versus 35% with placebo (Tsertsvadze et al., Annals of Internal Medicine).
Planning when to take a tablet can become part of the pressure. That is why some men prefer daily tadalafil.
Tadalafil is usually taken as needed, at least 30 minutes before sex (10 mg to start, with 20 mg possible, up to once a day).
The UK prescribing information (SmPC) also says a once-daily regimen may be considered for men who expect to have sex at least twice a week, based on patient choice and prescriber judgement: 5 mg once a day, lowered to 2.5 mg if needed.
EAU guidance notes there is no clinically significant difference in effectiveness between daily and on-demand tadalafil, and that dosing and sex no longer need to be linked.
The SmPC also says the need for the daily regimen should be reassessed periodically.
Quick tip
EAU guidance says incorrect use or a lack of information is a main reason men do not respond to PDE5 inhibitors.
Sexual stimulation is still needed, timing matters, and a high-fat meal can delay absorption of sildenafil and vardenafil (EAU also lists avanafil, while tadalafil is less affected).
Your prescriber can talk you through it.
Most men can take them safely, but not everyone. That is why a proper consultation matters.
Never combine ED tablets with nitrates or poppers
PDE5 inhibitors must not be taken with nitrate medicines (such as GTN spray or isosorbide), nicorandil (another angina medicine), or "poppers" (amyl nitrite).
The combination can cause a dangerous drop in blood pressure.
If you have taken an ED tablet and need emergency care, tell the doctor or paramedic.
According to the UK prescribing information for sildenafil (Viagra), these medicines are also not suitable if you:
Other medicines can interact with PDE5 inhibitors too, and tadalafil has its own list, so your prescriber will go through everything you take. This is not a complete list.
For some men, a tablet is not the best place to begin. That can be because:
If a prescriber does not think treatment is right for you, they say so and explain why. You are not charged for treatment that is not issued.
Lifestyle changes will not fix everything. EAU guidance recommends starting lifestyle changes and risk factor modification before or alongside ED treatment, and rates the evidence for exercise and weight loss as good.
This is one of the most searched questions about ED in younger men, and the research is mixed.
A 2021 survey of 942 men aged 18 to 44 found no link between how much porn men used and ED. There were small to moderate links between ED and men feeling their porn use was out of control (Whelan and Brown, Journal of Sexual Medicine).
It was a self-selected online sample, so it cannot prove cause and effect.
A 2019 review of observational studies found little if any evidence that porn use induces ED, while noting that better long-term studies are needed.
If you feel it is affecting your sex life, cutting back for a while and talking it through with a therapist are both reasonable steps. There is no need for shame either way.
For many men, the hardest part is not the erection problem.
It is the silence around it.
Partners often assume it is about them ("Am I not attractive any more?") while the man is quietly panicking about performance.
The Nature Reviews primer notes that men with ED and depression are less likely to discuss it with their partners.
A few gentle ways in:
Our guide on how to talk to your partner about ED goes further.
Embarrassment is one of the main reasons men put off getting help, and criminals exploit it.
In February 2026, the MHRA reported that nearly 20 million doses of illegal ED medicines were seized in the UK between 2021 and 2025, with a peak of 5.5 million in 2024.
The MHRA warned that illegal products may contain no active ingredient, the wrong dose, hidden drugs or toxic ingredients, and urged men to use registered pharmacies and seek medical advice.
All pharmacies in Great Britain, including those online, must be registered with the General Pharmaceutical Council (GPhC).
You can check a pharmacy on the GPhC register.
Since February 2025, GPhC guidance for online pharmacies also says there should always be a way for you and the prescriber to talk to each other in both directions, and that for higher-risk medicines the prescriber must verify what you tell them rather than relying on a questionnaire alone.
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Disclaimer
ED medicines are prescription-only. Decisions about whether any treatment is suitable for you are made by a GMC-registered prescriber based on your individual medical history. The information here is for general guidance and is not a substitute for professional medical advice. Our ED service is for men aged 18 and over.
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
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