Translation guide
A medical condition where a man cannot get or keep an erection. In Japanese, it is most commonly referred to as ED (イーディー), with the full term 勃起不全 (ぼっきふぜん) used in formal or medical contexts.
erectile dysfunction
Most common term in everyday conversation.
erectile dysfunction (formal/medical)
Used in clinical or formal contexts.
The inability to achieve or maintain an erection sufficient for sexual intercourse.
The most common and neutral way to refer to erectile dysfunction in everyday Japanese. It is an initialism borrowed from English, pronounced イーディー.
Recently, more men are suffering from ED.
The formal medical term for erectile dysfunction. Used in clinical settings, official documents, or when a precise term is needed.
There are several treatment options for erectile dysfunction.
A slightly less common synonym for 勃起不全, also used in medical contexts. It literally means 'erection disorder'.
He consulted a specialist because of erectile dysfunction.
ED is widely understood and used in Japan, even in advertising for treatments. It is pronounced as the English letters 'E' and 'D' (イーディー), not as a word. In casual conversation, it is perfectly acceptable.
Both are medical terms, but 勃起不全 is more common. 勃起障害 is sometimes used to emphasize the disorder aspect, but in practice they are interchangeable. Stick with 勃起不全 for formal writing.