The relationship of headache as a symptom to COVID-19 survival: A systematic review and meta-analysis of survival of 43,169 inpatients with COVID-19.

Headache among patients with COVID-19 presenting to hospitals may be a marker of host processes which enhance COVID-19 survival. Future studies should further confirm these findings, in order to better understand this relation and to try to address possible limitations related to the inclusion of more severe patients who would be unable to report symptoms (e.g., patients who were intubated).