Something recurring happens over and over. When you have a recurring cough, it could be something serious, like bronchitis.
This is a word for things that keep popping up or returning, like flowers are a recurring subject of the artist Georgia O’Keefe’s paintings. Recurring lateness is a habit your teacher or boss won’t tolerate. Lots of people have recurring health problems, such as back pain or sore knees. A guest character on a TV show who shows up once in awhile is a recurring character: they just keep coming back.