Background Fibromyalgia (FM) and primary hyperparathyroidism (PHPT) are diseases that can present similar symptoms such as musculoskeletal pain, cognitive impairment, nonrefreshing sleep, depression and anxiety, and thus, cause diagnostic confusion.
Objectives To determine the frequency of asymptomatic PHPT in patients with FM and to evaluate the association of laboratory findings with clinical symptoms.
Methods A cross-sectional study was conducted which included 100 women diagnosed with FM as per the criteria of the American College of Rheumatology (ACR - 1990 and 2010) and 57 healthy women, to whom dosages of parathyroid hormone (PTH), calcium and albumin were taken in addition to which a survey of the clinical symptomatology was made in the FM group
Results The mean age in both groups was similar (46.8 years old in the FM group and 42.1 in the comparison group, p=0.185). The mean value NTP of calcium in the FM group was 12.3 mg/dL and the PTH was 133.9 pg/ml, these being significantly higher than in the comparison group, where the value of calcium was 9.4 mg/dL and that of PTH was 52.2 pg/ml (p<0.001 for both values). Hypercalcemic PHPT was diagnosed in 6% of FM patients, and 17% presented only high PTH, which characterizes normocalcemic PHP. There was no statistically significant association of PTH levels and calcium with FM symptoms, with the exception of epigastric pain, which was more frequent in the group of patients with PHPT and FM (p=0.012).
Conclusions There is a high frequency of PHPT in FM patients compared with healthy women. Future studies are needed to assess whether this is just a random association, whether the increases in PTH serum are part of the physiopathology of FM or even whether, should they not be cases of FM, they may be cases of asymptomatic PHPT.
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Disclosure of Interest None Declared
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