For a lot of guys, experiencing “blue balls” is just a euphemism for sexual frustration. But if you’ve felt some pain down there—or actually noticed your testicles turning a darker shade—medical science offers a few explanations.
When it comes to a dull ache in your balls, the most common hypothesis is that the flow of blood to your penis and scrotum when you’re aroused builds up and, if not released, puts pressure on your testicles that causes this minor pain, explains Darius Paduch, M.D., an associate professor of urology at Weill Cornell Medical College. As every 13-year-old understands, ejaculating can relieve this pressure, Dr. Paduch says.
There’s also some evidence that a prolonged erection can cause some of the oxygen in your blood to be absorbed by the tissue in your genitals, which can leave the blood with a blue-ish hue, says urologist Richard K. Lee, M.D., also of Weill Cornell. Dr. Lee says this usually only happens when there’s some type of blockage. “Erectile dysfunction drugs or blood flow-constricting devices like a penis ring could cause this, but it’s not likely to occur naturally,”
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