CALCA and pseudohypoparathyroidism type 1A: However, elevated calcitonin levels can be observed in conditions other than MTC, such as acute trauma, chronic pulmonary diseases, chronic renal failure, hypercalcemia, hypergastrinemia, inhalation injury, other neuroendocrine tumors, pseudohypoparathyroidism, and thyroiditis [16,17,18,19].