The pupil and headaches.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003027:Cluster Headache / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000503:physiopathology; D011680:Pupil / Q000502:physiology*; D014653:Vascular Headaches / Q000503:physiopathology*