A case of normocalcemic variant of secondary hyperparathyroidism due to vitamin D deficiency

The clinical manifestations of severe and/or prolonged vitamin D deficiency in adolescents differ from those in younger children. Vitamin D deficiency in adolescents may be asymptomatic or with nonspecific symptoms (pain in the joints, back, hips, difficulty walking, climbing stairs, rising from a squatting position, running, and muscle cramps), which reduce the quality of life. At the same time, teenagers with vitamin D deficiency are mistakenly diagnosed with fibromyalgia, chronic fatigue syndrome or depression. The article presents a clinical case of diagnosis and treatment of secondary hyperparathyroidism in a teenager due to vitamin D deficiency.