The percentages of Th22 cells, Th17 cells and IL-17A+IL-22+CD4+ T cells were negatively correlated with the levels of serum TSH in the HT patients (r = −0.8402, p<0.0001; r = −0.8589, p<0.0001; r = −0.8289 p<0.0001, respectively). The gene discussed is IL17A; the disease is hematocrit.