A. Headache previously diagnosed as 10. Headache attributed to disorder of homoeostasis, and fulfilling criterion C
B. The disorder of homoeostasis causing the headache has been effectively treated or has spontaneously remitted
C. Headache has persisted for >3 months after effective treatment or spontaneous remission of the disorder of homoeostasis
D. Not better accounted for by another ICHD-3 diagnosis.