Meaning and Usage
"再発" (さいはつ) primarily refers to the recurrence or relapse of something, often used in medical contexts such as diseases or symptoms returning after a period of improvement. It can also apply to the reoccurrence of problems or issues in other contexts.
Common Contexts
Most frequently, "再発" is used when discussing health, especially chronic illnesses or conditions that can come back after treatment. It also appears in discussions about behavioral problems or technical issues that happen again.
Collocations and Patterns
- 再発する: to relapse or recur; used to describe the event of something happening again.
- 再発防止 (さいはつぼうし): prevention of recurrence; common in medical or safety contexts.
- 再発リスク: risk of recurrence; often used in health or risk management discussions.
Register and Nuance
"再発" is a formal term, suitable for medical, academic, or professional settings. It is less common in casual conversation unless discussing serious topics.
Common Learner Mistake
Learners sometimes confuse "再発" with "再生" (regeneration) or "再開" (resumption). Remember, "再発" specifically means something negative returning, like a disease or problem, not just restarting or regenerating.