As temperatures climb, many men are noticing an uncomfortable—and sometimes embarrassing—phenomenon: their testicles seem to sag or swell more than usual. Dubbed “summer long balls,” this isn’t just locker-room talk. It’s a real issue tied to heat, circulation, and even fertility.
While last summer’s viral term “summer penis” referred to how warm weather can make things appear fuller due to increased blood flow, “summer long balls” shifts focus to the scrotum—and it’s not just about appearance. The heat causes blood vessels to expand, and in some men, especially those with a condition called varicocele, it can lead to more noticeable changes.
“A varicocele is like a varicose vein, but in the scrotum,” says urologist Dr. Yaniv Larish. “When it’s hot out, the blood doesn’t circulate efficiently. Instead, it pools and heats up the area, causing the testicle to hang lower and feel warmer than usual.”
Varicoceles affect about 15% of men and are linked to fertility problems in up to 40% of male infertility cases, according to the Cleveland Clinic. While not always painful, the extra warmth and pressure during summer can intensify discomfort. Some men report experiencing sticky skin, which causes a “bat wing” effect or a noticeable pull when wearing loose clothing or swim trunks.
Doctors recommend staying cool, hydrated, and wearing snug-fitting underwear to reduce movement and support circulation. For individuals with persistent symptoms, surgical treatment for varicoceles is a viable option.
If you’ve been adjusting more than usual down there this summer, you’re not alone. And while it might seem like a harmless seasonal side effect, it could be a sign of something worth checking out, especially if fertility or ongoing discomfort is a concern.
