Natural History Study of Parathyroid Disorders

Study Description: Patients with confirmed, suspected or at risk of developing parathyroid disorders will be provided standard of care testing for their condition. Data obtained during the testing will be used for research. Additionally, samples may be collected for research. Objectives: * To investigate the cause of the disease and its associated manifestations, possibly genetic in participants with parathyroid and related disorder(s) * To identify biomarkers of the various parathyroid disorder(s) and associated manifestations by performing molecular profiling of available biospecimens * To describe evolution, natural history and longitudinal trends of parathyroid and related disorders including the associated extra-parathyroid manifestations seen in these disorders, for example, Zollinger-Ellison syndrome, gastro-entero-pancreatic neuroendocrine tumors, kidney, jaw, pituitary, and uterine tumors. * To investigate the natural history of parathyroid disorders and associated manifestations during pregnancy * To characterize the morbidity and mortality in participants with parathyroid and related disorders and investigate its association with extra-parathyroidal manifestations. * To investigate long-term risks and benefits with standard of care testing and therapy for parathyroid and associated extra-parathyroidal manifestations.