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PHPT is the most common cause of hypercalcemia in the outpatient setting [3, 4]. The incidence of this disorder is estimated to be 27–30 per 100,000 person-years in the USA, the UK, and Sweden [5, 6], with prevalence estimated at 1:1,000 in men and 2–3:1,000 in women. No studies have specifically evaluated the incidence or prevalence of asymptomatic PHPT.

Griebeler et al. [7] evaluated population-based secular trends in the incidence of PHPT in a mostly Caucasian population in Rochester, MN, USA, to determine if there had been a significant change in the incidence of PHPT between 2002 and 2010, and, if possible, to identify any changes in clinical practice that might be responsible. The findings were added to the historical cohort of patients that has been followed since 1965, and incidence rates adjusted to the 2010 US white population. A total of 1,142 Rochester residents had been diagnosed with PHPT since 1965, with 341 newly diagnosed cases in 2002–2010. Two periods of increased incidence occurred, one beginning in 1974, with a peak of 121.7 per 100,000 person-years, and a second peak of 86.2 per 100,000 person-years, beginning in 1998.

Yeh et al. [8] evaluated the incidence and prevalence of PHPT in a racially mixed population including 3.5 million enrollees within the Kaiser Permanente Southern California health system. The incidence of PHPT fluctuated from 34 to 120 per 100,000 person-years (mean 66 per 100,000) among women, and from 13 to 36 (mean 25 per 100,000) among men. With advancing age, the incidence increased and sex differences became pronounced, with the incidence estimated at 12–24 per 100,000 for both sexes younger than 50 years, 80 and 36 per 100,000 for women and men aged 50–59 years, respectively, and 196 and 95 per 100,000 for women and men aged 70–79 years, respectively. The incidence of PHPT was highest among blacks, with 92 and 46 per 100,000 for women and men (p < 0.0001), followed by whites, with 81 and 29 per 100,000 for women and men, with rates for Asians (52 and 28 per 100,000 for women and men), Hispanics (49 and 17 per 100,000 for women and men), and other races (25 and 6 per 100,000 for women and men) lower than that for whites (p < 0.0001).

Yu et al. [9] evaluated the prevalence and incidence of diagnosed PHPT in adults in a population-based study between 1997 and 2006 in Tayside, UK. The prevalence of diagnosed PHPT increased from 1.82 per 1,000 population in 1997 to 6.72 per 1,000 population in 2006 (p < 0.001). The prevalence of PHPT was higher in females, and the female preponderance increased with age. The annual prevalence ratio between women and men was stable at around 2.5 each year. The higher prevalence figures obtained in this study compared to other studies is likely to be due to differences in methodology.