“…Previously, concentrations of steroid hormones, such as cortisol, aldosterone, and testosterone, have been widely investigated in patients with CSC; however, the findings have not been consistent, showing associations in some studies but not in others [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Serotonin (5-hydroxytryptamine (5-HT)), a neurotransmitter, influences many brain functions and plays important roles in the gastrointestinal system, blood, and brain, affecting behavior and physiology [ 17 ].…”