Meanwhile, in the serum of HF patients, the expression of several inflammatory cytokines appeared substantially elevated, including tumor necrosis factor‐α (TNF‐α), interleukin‐6 (IL‐6), interleukin‐1b (IL‐1b), soluble suppression of tumorigenicity‐2(sST2), and Galectin‐3(Gal‐3) (Figure 1D–H). Here, IL6 is linked to hydrops fetalis.