Acute glaucoma can present either silently or as a headache of variable severity.
Rotberg
M
M
D000368:Aged; D003951:Diagnostic Errors; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000150:complications* / Q000175:diagnosis* / Q000503:physiopathology; D006261:Headache / Q000209:etiology*; D006801:Humans; D007429:Intraocular Pressure