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診断されました。
I was diagnosed with intrinsic asthma.
私は内因性のうつ病で長い間苦しんできました。
I have suffered from endogenous depression for a long time.
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脳内麻薬が分ぴつされます。
When a traumatic event occurs, endogenous opioids — the brain's natural narcotics — are secreted in order to ease the suffering.