relapse|relapsed|relapses

她康复后不久病情就复发了。

Her ___relapse occurred shortly after she had recovered.

尽管接受了治疗，她的抑郁症还是复发了。

Despite treatment, her depression ___relapsed.

他的感冒症状在好转几天后又复发了。

His cold symptoms showed ___relapses after a few days of improvement.