Are blue balls real? A GP on what's actually going on

The ache after getting turned on with no orgasm has a nickname, a Latin-sounding medical label, and almost no research behind it. Our lead GP, Dr Luke Pratsides, on what's real, what isn't, and when testicular pain needs a doctor.

Are blue balls real?

The discomfort is real. Plenty of men get a heavy, aching feeling in the testicles after being aroused for a while without ejaculating, and in the largest survey done on it, 56% of people with a penis said they had experienced it.¹ It usually passes within minutes to a few hours on its own.

What isn't established is the explanation. "Blue balls" is popularly called epididymal hypertension, but that label comes from a single 2000 case report rather than any body of research,² and a 2024 expert opinion in the Journal of Sexual Medicine argues the mechanism is a fallacy.^3,4

And nothing turns blue.

Do your testicles actually turn blue?

No. There's no published evidence of anyone's scrotum changing colour from arousal, and no imaging or measurement showing blood pooling in the testicles at all.^1,3

The name is older than the theory. A 2025 review traced descriptions of arousal-related scrotal discomfort back through 18th and 19th century medicine, under labels including "spermatic colic" and "testicular epilepsy", where it was often used to argue that sexual restraint was its own punishment.⁵ The colour stuck. The explanation never got tested.

What causes blue balls?

The bit that isn't in dispute is what arousal does to blood flow. Here's Dr Luke:

"Epididymal hypertension is more commonly known as blue balls. It's caused by the increased blood flow to the genitals during sexual arousal. This increased blood flow is normal and important for achieving and sustaining an erection. However, if sexual arousal is prolonged without ejaculation, the blood vessels around the testicles remain enlarged and cause too much blood flow to the genitals. In turn, the genitals increase in size and become heavy. This can be very uncomfortable."

The nervous system is doing two opposite jobs. Arousal runs on the parasympathetic nervous system, which widens blood vessels and increases blood flow.^6,7 Ejaculation runs on the sympathetic nervous system, which narrows them again and brings blood flow back to baseline.⁶ Skip the second half and the first half stays switched on for a while.

The leading theory is that blood drains out of the testicles more slowly than usual afterwards, and that this accounts for the ache.¹ It's a reasonable idea. It has never been demonstrated.

The epididymis, incidentally, has no particular role in any of this. It's the coiled tube behind each testicle where sperm is stored and matures, and it ended up in the name by association.⁸

What blue balls feel like

Most men describe heaviness, a dull ache, or mild pain across both testicles, sometimes with a pulling sensation. In the 2023 survey, among people with a penis who'd experienced it:¹

• 58% called it mild.

• 36% called it moderate.

• 7% called it severe.

It's also not a regular event for most people. Around 81% said it happened rarely or very rarely, and 2% said every time.¹

How to get rid of blue balls

There's no treatment, because there's nothing to treat. It resolves by itself. If you want it to pass sooner, these are the things men actually report helping:¹

• Wait. This is the honest answer, and for most men it's the whole answer. Give it half an hour.

• Distraction. Anything absorbing and non-sexual. Arousal fades and blood flow follows it.

• Orgasm, on your own. Masturbation works and involves nobody else.

• A cold shower. Some men swear by it. No study has tested whether cold exposure actually changes blood flow to the testicles, so treat it as worth a try rather than a mechanism.

• Light exercise or a walk. Reported as helpful, same evidence level as the cold shower.

Paracetamol or ibuprofen is reasonable if you're uncomfortable, as you'd use it for any other minor ache. If you're reaching for painkillers regularly for testicular pain, that's a reason to see a doctor rather than manage it yourself.

How long do blue balls last?

Minutes to a couple of hours for most people. Survey responses described anything from a few minutes to under an hour, some several hours, and a small number over the course of days.¹

Pain that lasts more than an hour, or that carries on when you're resting, is not blue balls. That's an emergency, and this is why.

When testicular pain needs a doctor

This is the part worth reading properly. Blue balls is harmless. Some things that feel similar are not.

Go to A&E or call 999 if you have:⁹

• Sudden, severe pain in a testicle.

• Testicle pain with feeling sick, being sick, or stomach pain.

• Testicle pain lasting more than an hour, or continuing at rest.

The condition to rule out is testicular torsion, where the testicle twists and cuts off its own blood supply. It is time-critical: the testicle can usually be saved if it's treated within about six hours, and rarely after 24.¹⁰ It comes on abruptly and hurts badly.

Ask for an urgent GP appointment or call NHS 111 if you have:⁹

• Aching or discomfort in your testicles that's worrying you.

• A lump, swelling, or a change in shape or how they feel.

• One testicle that's become bigger than the other.

Here's Dr Luke:

"Once ejaculation has occurred or arousal has diminished, the pain or discomfort should go away within minutes or hours. If the pain is persistent or worsening it's important to seek medical advice from your doctor. If you experience severe, persistent pain and swelling in the testicle then seek urgent medical care as this is likely a sign of something more serious than epididymal hypertension. For instance, it could be testicular torsion."

Can women get blue balls?

Yes, and it has a name. In the 2023 survey, 42% of people with a vagina reported the same genitopelvic ache after arousal without orgasm.¹ They rated it milder on average: 84% mild, compared with 58% of people with a penis.

"Blue vulva" hasn't had the cultural airtime, which is probably why it sounds made up.

"I've got blue balls" is not a reason to have sex

The clearest finding in the whole literature has nothing to do with anatomy.

In the same survey, 40% of people with a vagina said they had been pressured into sexual activity because of a partner's fear of blue balls. Among people with a penis, it was 4%.¹ Participants described it in plain terms. One: "Men have used this to pressure me many times." Another, a man: "It's an excuse men use to get sexual relief."

Both research groups working on this treat coercion as the clinically important part.^3,4 Their reasoning is simple. Blue balls resolves on its own, masturbation is available, and no medical need exists that requires another person's participation.

So the practical version: if you're aching, sort it out yourself. If your partner is aching, their discomfort is real and it also isn't your responsibility to fix.

Arousal problems that aren't blue balls

Occasional discomfort after a session that doesn't finish is normal. Some related things are not, and they're treatable:

• Trouble getting or keeping an erection. That's erectile dysfunction, and it's common and very treatable.

• Finishing sooner than you'd like, or struggling to finish at all. Worth reading up on premature ejaculation.

• Recurring testicular pain, swelling, or lumps. See a doctor.

If you're curious about what actually happens when you go longer without ejaculating, we've covered going a month without ejaculating separately. And if drink or drugs are in the picture, what recreational drugs do to your sex life is worth ten minutes.

The numan take

Blue balls is a real experience with a shaky explanation. Over half of men get that heavy ache after arousal without orgasm, it clears up on its own within minutes to hours, and nothing turns blue. "Epididymal hypertension" sounds official but rests on one case report, and researchers actively disagree about whether the mechanism holds up. Wait it out, distract yourself, or masturbate. What it is never is a reason to pressure someone into sex. And if testicular pain is sudden, severe, or lasts more than an hour, that's A&E, not blue balls.

References

^{1 Levang S, Henkelman M, Neish R, Zukerman W, Terrell B, Jackman V, et al. "Blue balls" and sexual coercion: a survey study of genitopelvic pain after sexual arousal without orgasm and its implications for sexual advances. Sex Med. 2023;11(2):qfad016.}

^{2 Chalett JM, Nerenberg LT. "Blue balls": a diagnostic consideration in testiculoscrotal pain in young adults: a case report and discussion. Pediatrics. 2000;106(4):843.}

^{3 Jones JM, Cedermark K, Barham D, Gross MS. Does blue balls exist, and why should we care? J Sex Med. 2024;21(2):88-9}

^{4 Jones JM, Cedermark K, Barham D, Gross MS. Response to Letter to the Editor on "Does blue balls exist, and why should we care?" J Sex Med. 2024;21(8):742-3.}

^{5 Janssen DF. Blue balls: a brief history. Sex Med Rev. 2025;13(3):423-30.}

^{6 LeBouef T, Yaker Z, Whited L. Physiology, autonomic nervous system. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 [updated 1 May 2023; cited 5 August 2026]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK538516/}

^{7 Panchatsharam PK, Durland J, Zito PM. Physiology, erection. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 [updated 1 May 2023; cited 5 August 2026]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK513278/}

^{8 Tiwana MS, Leslie SW. Anatomy, abdomen and pelvis: testes. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 [cited 5 August 2026]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK470201/}

^{9 National Health Service. Testicle pain [Internet]. London: NHS; 2025 [reviewed 26 June 2025; cited 5 August 2026]. Available from: https://www.nhs.uk/symptoms/testicle-pain/}

^{10 Schick MA, Sternard BT. Testicular torsion. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 [updated 12 June 2023; cited 5 August 2026]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK448199/}