Internal Cause
Internal Factor, Endogenous Factor
noun
The inside cause is an internal cause. Internal causes are usually the nastiest causes, if you ask me.
This word is mostly used in the fields of medicine and psychology. You’ll often see it as 内因性, which is a technical term used to talk about factors that originate within a person or an organism.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
内因性ぜんそくだとしんだんされました。
I was diagnosed with intrinsic asthma.
トラウマになる出来事が起きると、その苦しみを和らげるために、内因性オピオイドというのう内ま薬が分ぴつされます。
When a traumatic thing happens, endogenous opioids, which are morphine-like substances, will be secreted.
私が長い間苦しんできた本当の理由は、どうやら内因性の精神疾患のせいらしい。
The real reason I’ve been suffering for a long time is apparently because of an endogenous mental illness.