You're the flight surgeon: severe headache.
Geyer
D E
DE
D000328:Adult; D000337:Aerospace Medicine; D003937:Diagnosis, Differential; D006261:Headache / Q000821:virology*; D006563:Herpes Zoster Ophthalmicus / Q000150:complications* / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008889:Military Personnel; D012017:Referral and Consultation