our patients have suffered from headaches since their youth. During the period of manifest disease this symptom is found in the greatest variety of forms: as pressure in the entire head, behind the forehead, and especially frequently in the occipital region
Bleuler catalogs headache as a constitutive, polymorphic somatic symptom of schizophrenia, noting its possible relation to sexuality in its occipital presentation and distinguishing it from mere organic complication.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis