Hashimoto's thyroiditis (HT) is an autoimmune disease characterized by the production of thyroid autoantibodies against thyroid peroxidase (TPO) and thyroglobulin (Tg) that attack thyroid cells by cell‐ and antibody‐mediated immune processes and cause progressive fibrosis (Ragusa et al., 2019). This evidence concerns the gene TPO and hematocrit.