This is the 3133rd most frequent Japanese word.
再発
"再発" means "recurrence" or "relapse."
This usage refers to a medical condition reoccurring, emphasizing the idea of 'relapse' or return of symptoms.
彼の病気は再発してしまった。
His illness relapsed.
This example highlights '再発' as the recurrence of events or issues in a non-medical context, specifically corporate concerns.
会社の財務問題が再発する恐れがある。
There is a risk of the company's financial issues recurring.
Here, '再発' is used in a general sense, applicable to any situation where recurrence is possible, focusing on prevention.