
wiederkehrend
recurring
Something that happens at certain intervals or again and again; occurring repeatedly.
Er leidet unter wiederkehrenden Albträumen.
He suffers from recurring nightmares.
recurring
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recurring
Something that happens at certain intervals or again and again; occurring repeatedly.
Er leidet unter wiederkehrenden Albträumen.
He suffers from recurring nightmares.
'Wiederkehrend' (recurring) is the present participle of the separable verb 'wiederkehren' (to recur / to return). It is made up of 'wieder' (again) and 'kehren' (to return) and therefore describes something that keeps coming back.
Das wiederkehrende Motiv in dem Roman ist die verlorene Heimat.
The recurring motif in the novel is the lost homeland.
As an adjective, 'wiederkehrend' (recurring) can stand before a noun or be used as part of the predicate at the end of the sentence. Both positions are common.
Das ist ein wiederkehrendes Problem mit der Software.
That is a recurring problem with the software.
The adjective is often used to describe regular or chronic things. Typical combinations are 'wiederkehrende Schmerzen' (recurring pain), 'wiederkehrende Fragen' (recurring questions), or 'wiederkehrende Ereignisse' (recurring events).
Gegen die wiederkehrenden Kopfschmerzen hat sie ein Medikament bekommen.
She was given medication for the recurring headaches.
regular
Regelmäßig and wiederkehrend both describe events that happen more than once. Regelmäßig additionally indicates a consistent and predictable time pattern. Wiederkehrend also fits when something happens again but not at equal intervals.

Die Beschwerden sind wiederkehrend, treten aber in ungleichen Abständen auf.
The symptoms are recurring, but they occur at irregular intervals.
Die Beschwerden treten regelmäßig jeden Montag auf.
The symptoms occur regularly every Monday.