Abstract
BACKGROUND: The impact of headache on dementia is largely unknown. This study examined the association between headache and dementia using data from a large population-based study. METHODS: This population-based study used data from the Nord-Trøndelag Health Surveys performed in 1995-1997 (HUNT2) and 2006-2008 (HUNT3). The reference group (controls) was participants aged ≥55 years who answered the headache questions in HUNT2 and later participated in HUNT3 (n = 15,601). The association with headache status in HUNT2 was investigated in sample of confirmed non-demented elderly evaluated with psychometric tests after HUNT3 (n = 96), and HUNT2 participants later diagnosed with dementia during 1997-2011 (n = 746). The association with headache was evaluated by logistical regression with adjustment for age, gender, level of education, comorbidity, smoking, and anxiety and depression. RESULTS: Any headache was more likely to be reported in HUNT2 among those who later were included in the dementia registry (OR 1.24; 95 % CI 1.04-1.49) compared to the reference group, but less likely among the confirmed non-demented individuals (OR 0.62; 95 % CI 0.39-0.98). This relationship was even stronger for non-migrainous headache, whereas such association was not found for migraine. CONCLUSIONS: Compared to the reference group, individuals with dementia were more likely to report non-previous migrainous headache in HUNT2, whereas a sample of confirmed non-demented were less likely to report previous non-migrainous headache.