Peripheral arthritis and enthesitis are common. The main extra-articular manifestations of the disease are recurrent iritis, and recurrent or chronic prostatitis, while other extra-articular manifestations are rare.
Liðbólgur, bólgur í hælsinafestum, lithimnubólga og blöðruhálskirtilsbólga, eru algeng utan-hryggjar einkenni eða fylgieinkenni þessa sjúkdóms.