1) Appears again 2) Becomes chronic 3) Comes back 4) Comes over 5) Comes up again 6) Follows a pattern 7) Happens again 8) Happens intermittently 9) Happens more than once 10) Happens over and over 11) Happens periodically 12) Happens repeatedly 13) Happens yet again 14) Is cyclic 15) Keeps happening