Chronic post-non-bacterial infection headache

Diagnostic criteria:

Headache, no typical characteristics known, fulfilling criteria C and D.
A non-bacterial infection has been present but has been effectively treated or has remitted spontaneously.
Headache has been attributed to the infection.
Headache persists for >3 months after effective treatment or spontaneous remission of the infection.

There is little evidence for the existence of chronic headache attributed to non-bacterial infections.

References
1. The International Headache Society. The International Classification of Headache Disorders, 2nd edition. Written 2004. Mirror https://www.teethremoval.com/ihc_II_main_no_print.pdf