When a person is happy, his brain function is perfect. Perfect brain function is conducive to regulating the excitement and inhibition of the central nervous system, promoting the endocrine system, immune system and digestive system to play a normal role, coordinating and balancing, delaying the pathological process of important organs, and avoiding or reducing the occurrence of malignant diseases such as arteriosclerosis. For the sake of physical and mental health, we should pay attention to cultivating our optimism and overcome all kinds of emotional and emotional troubles and crises in time.