[Pain syndromes and insomnia: the role of association with comorbid mental disorders (on the model of glossalgia)].

Insomnia in chronic pain is very common. On the one hand, studies show that sleep deprivation can enhance pain perception. On the other hand, chronic pain can trigger a variety of sleep disorders. One of the localizations of chronic pain syndrome is the oral mucosa. Somatoform pain disorder related to oral mucosa called «glossalgia» or «burning mouth syndrome» (BMS). The prevalence of insomnia in the study sample was 61.1%. The statistically significant positive correlation was found between the severity of insomnia (PSQI) and the severity of anxiety on both GAD-2 and HADS, while insomnia showed no correlation with depression and pain severity. At the same time, the severity of anxiety showed statistically significant positive correlation with the severity of pain assessed by VAS.