itis = inflammation

Infection can cause an itis, but not all itis is due to infection. Such as inflammatory arthritis (noninfectious) vs septic arthritis (infectious).

Ah, close. Thanks, then.

In french we occasionally portmanteau -itis (often qualified with "acute" or "mild"), for a comedic yet genuinely emphatic effect. e.g: acute dumbitis/boreditis/tireditis

In Spanish too.

I've definitely seen high school seniors get a big head!