Blue balls is caused by blood pooling in the testicles during prolonged sexual arousal without orgasm. The medical term is epididymal hypertension, and it happens because arousal increases blood flow to the genitals. Normally, orgasm triggers that blood to flow back out. When it doesn’t, the lingering congestion creates pressure and a dull ache that most people feel for minutes, though it can occasionally last a few hours.
How Arousal Creates the Pressure
When you become sexually aroused, blood rushes into the genital area and the vessels that normally drain blood away partially constrict to maintain an erection. This is the same hydraulic process behind erections themselves. The testicles can swell by 25 to 50 percent during arousal as blood and fluid accumulate in the tissue.
Orgasm acts as the release valve. It triggers a series of muscle contractions that push blood back into general circulation and return the testicles to their resting size. Without that release, the extra blood sits in the area longer than it normally would, raising pressure in the small blood vessels of the epididymis (the coiled tube behind each testicle). That elevated pressure is what you feel as discomfort.
What It Actually Feels Like
Despite the name, your testicles almost certainly won’t turn blue. The “blue” likely refers to the bluish tint that oxygen-depleted blood can give to skin, but in practice, visible color change is rare and mild at most. What you will notice is one or more of these sensations: a dull ache, throbbing, a feeling of heaviness or pressure, mild swelling, or general discomfort in the testicles and lower groin.
The pain is typically mild. A large survey of over 2,600 people conducted by researchers at Queen’s University in Ontario found that fewer than 7 percent of respondents with a penis reported severe pain levels from blue balls. For most people, the discomfort is more annoying than alarming and resolves on its own fairly quickly.
How Long It Lasts
The discomfort is temporary. In most cases, it fades within minutes once arousal subsides. In rare cases, the sensation can linger for a few hours, but it always resolves on its own as blood flow returns to normal. Blue balls does not cause any lasting damage to the testicles or reproductive system.
How to Make It Go Away Faster
The most direct way to relieve the pressure is ejaculation, either through sex or masturbation, because orgasm triggers the blood to drain from the area. But that’s not your only option. Anything that shifts your body out of an aroused state will help:
- Exercise: Physical activity redirects blood flow to your muscles and away from the genitals.
- A cold shower or bath: Cool temperatures cause blood vessels to constrict, helping move blood out of the area.
- Distraction: Simply turning your attention to something non-sexual allows arousal to fade naturally, and the extra blood drains on its own.
You don’t need to “do” anything about blue balls if you don’t want to. It resolves without intervention every time.
Can Women Get Blue Balls?
The same basic mechanism can happen to anyone. People with a vulva can experience pelvic congestion from prolonged arousal without orgasm, sometimes called “blue vulva” or simply pelvic heaviness. The physiology is the same: blood flows into the genital area during arousal and creates pressure if it doesn’t drain through orgasm. The Queen’s University survey included respondents of all genital anatomies, confirming that this isn’t exclusively a male experience.
When Testicular Pain Means Something Else
Blue balls has one defining feature: it only happens during or right after sexual arousal. If you’re experiencing testicular pain at other times, something else is going on.
Testicular torsion is the most urgent possibility. This happens when a testicle twists on its cord, cutting off blood supply. It causes sudden, severe pain and swelling, and it often requires emergency surgery. Unlike blue balls, the pain is intense and unrelated to arousal. If your testicles actually appear blue or purple, that’s not “blue balls” in the colloquial sense. It could indicate restricted blood flow that needs immediate medical attention.
Other conditions that cause testicular pain outside of arousal include infections of the epididymis, inguinal hernias, and (rarely) testicular tumors. Warning signs that point to something more serious include a lump or enlargement in either testicle, a dull ache in the groin that persists regardless of arousal, and pain in the lower back. Persistent or recurring testicular pain that has nothing to do with sexual activity is worth getting checked out.