BACKGROUND: @entity2531 ( @entity2531 ) is a common @entity158 condition in the face. @entity1 with @entity2531 report multiple @entity158 comorbidities. The presence of @entity239 and @entity2704 in @entity1 with @entity2531 is associated with an increase in @entity2531 @entity158 intensity and duration. However, data on the relationship between increasing number of @entity158 comorbidities and @entity2531 @entity158 are rare. The aims of this study were: firstly to evaluate the extent to which increasing number of comorbidities is associated with increasing @entity2531 @entity158 intensity and duration; and secondly to evaluate the extent to which the presence of specific comorbidities is associated with increasing @entity2531 @entity158 intensity and duration. METHODS: The sample included 180 @entity1 seeking @entity2531 treatment at Boston and Montreal clinics. @entity2531 was diagnosed using the Research Diagnostic Criteria for @entity2531 . A Numerical Pain Rating Scale assessed @entity2531 @entity158 intensity and @entity1 provided their @entity2531 @entity158 duration in a study questionnaire. The comorbidities of @entity2704 , @entity5815 , @entity1744 , @entity2335 and @entity4531 were diagnosed by 5 validated diagnostic questionnaires. The associations were analyzed by linear regression, controlling for confounders. RESULTS: There was a positive association between the number of comorbidities present and @entity2531 @entity158 intensity (p   <   0.01) and between the number of comorbidities present and @entity2531 @entity158 duration (p   <   0.01). Also, the presence of @entity2704 was positively associated with @entity2531 @entity158 intensity (p   <   0.01) and the presence of @entity5815 was positively associated with @entity2531 @entity158 intensity (p   <   0.05) and with @entity2531 @entity158 duration (p   <   0.01). When @entity2531 @entity1 were separated into groups, these associations did not change for the @entity158 group, whereas in the non- @entity158 group, the relationship between number of comorbidities and @entity2531 @entity158 duration was the only one still present. CONCLUSION: This study shows that the number of comorbidities is positively associated with @entity2531 @entity158 duration and intensity. The presence of specific conditions, such as @entity5815 , is associated with an increase in @entity2531 intensity and duration.

Specific and number of comorbidities are associated with increased levels of temporomandibular XXXX intensity and duration.

@entity1 :: ('9606', 'Species') :: ['participants', 'patients', 'people', 'People'] @entity239 :: ('MESH:D005356', 'Disease') :: ['fibromyalgia'] @entity2335 :: ('MESH:D003556', 'Disease') :: ['interstitial cystitis'] @entity2704 :: ('MESH:D008881', 'Disease') :: ['migraine'] @entity2531 :: ('MESH:D013001', 'Disease') :: ['Temporomandibular pain disorder', 'TMD'] @entity158 :: ('MESH:D010146', 'Disease') :: ['myofascial pain', 'pain'] @entity5815 :: ('MESH:D015673', 'Disease') :: ['chronic fatigue syndrome', 'migraine and chronic fatigue syndrome'] @entity4531 :: ('MESH:D012148', 'Disease') :: ['restless leg syndrome'] @entity1744 :: ('MESH:D043183', 'Disease') :: ['irritable bowel syndrome']
@entity158 :: (MESH:D010146,Disease) :: ['pain']
