Vitamin D deficiency is a possible factor involved in the etiology of chronic tension-type headache (CTTH). Vitamin D is directly associated with lifestyle and eating habits and affects a large proportion of the general population. The aim of this study was to investigate the role of vitamin D deficiency in CTTH. Patients aged 18 years or older that presented to our Neurology polyclinic with CTTH between December 1, 2017 and March 31, 2018 were reviewed retrospectively. Patients were assigned into three groups based on their Vitamin D levels: (I) deficiency state:
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