Serum GH levels in the ME/CFS group (0.22 ng/mL, IQR: 0.05–0.67) were significantly lower than in the no-fatigue group (0.37 ng/mL, IQR: 0.17–1.11; ** p < 0.01). This evidence concerns the gene GH1 and myalgic encephalomeyelitis/chronic fatigue syndrome.