Pathological processes of the PARATHYROID GLANDS. They usually manifest as hypersecretion or hyposecretion of PARATHYROID HORMONE that regulates the balance of CALCIUM; PHOSPHORUS; and MAGNESIUM in the body.

Synonyms: Disease, Parathyroid, Disorder, Parathyroid, Disorders, Parathyroid, Parathyroid Diseases, Parathyroid Disease, Diseases, Parathyroid, Parathyroid Disorder, Parathyroid Disorders