recurrence [recurrences](a return of symptoms as part of the natural progress of a disease) noun [UK: rɪˈk.ʌ.rəns] [US: rɪˈk.ɜː.rəns]There's a slight possibility of a recurrence. = Existe una pequeña posibilidad de recaída.
relapse(the act or situation of relapsing) noun [UK: rɪ.ˈlæps] [US: ri.ˈlæps]