Apart from CRP and IL-6, patients with FS experience an increase in tumor necrosis factor (TNFα), fibrinogen and D-dimers, low vitamin D concentration, decreased concentration of sex hormones and growth hormone, abnormal secretion of cortisol, or high level of C-glycosyl tryptophan (Życzkowska and Grądalski, 2010; Soysal et al., 2016; Koh and Hwang, 2019). This evidence concerns the gene TNF and Feingold syndrome.