Epididymal hypertension (EH), informally referred to as blue balls for males or blue vulva for females, is a harmless but uncomfortable sensation in the genital regions during a prolonged state of sexual arousal. It usually resolves within hours unless relieved through an orgasm.
In females, the discomfort occurs in the erectile tissue and clitoris of the vulva. It most often describes a temporary fluid congestion in the testicles or vulva, caused by prolonged sexual arousal without orgasm.
The term epididymal hypertension is derived from the epididymis, a part of the male reproductive system. The term is also applied to females despite the lack of an epididymis in female anatomy. Professor Caroline Pukall, who co-wrote the first in-depth study on EH, has suggested using the term throbbing crotch syndrome. The term "blue balls" is thought to have originated in the US, first appearing in 1916. Though lesser known, the equivalent of this phenomenon in females is informally referred to as "blue vulva", among other names. or inhibited ejaculation. There is scant information on the phenomenon in scientific literature. This is curious given that awareness of the condition goes back centuries, with many barely remembered terms having been applied to it between the early 18th through early 20th centuries. The treatment is to achieve orgasm, or alternatively strain to move a very heavy object—in essence doing a Valsalva maneuver.
Causes
The cause of epididymal hypertension is an excessive amount of blood circulation to the genital area, specifically the penis and testicles, without the release of tension associated with orgasm and ejaculation. When a significant volume of blood flows to the genital region, the penis becomes erect, and the testicles also experience increased blood flow and swelling.