病情缓解6年后，癌症又复发了。After six years of remission, cancer reappeared.癌症可能在多年之后复发。The cancer may re-emerge years later.多种令人情绪紧张的事情都可能引起旧病复发.A wide range of emotionally stressful events may trigger a relapse....

“复发”的英语可以翻译为：have a relapse，recrudesce，[医] palindromia，recidivation，recrudescence ...