5-HT is 5-hydroxytryptamine, also known as serotonin, is an important neurotransmitter that transmits information between nerve cells and is an endogenous active substance involved in regulating human emotions and various behaviors, including human diet, sleep, body temperature, mental and emotional regulation, and has a wide range of applications in mental system disorders. In recent years, it has been found that human platelets can produce 5-hydroxytryptamine in addition to its hemostatic effect. After producing 5-hydroxytryptamine, it will make the human body produce certain excitability, maintain emotional stability and mental clarity. If the platelet count decreases, the concentration of 5-hydroxytryptamine in the body will also decrease, and the patient will often show signs of mental depression and disinterest in everything around him. After treatment, the platelet count rises and the patient’s symptoms are significantly improved.