Etiology The primary cause of depression is emotional stimulation, and the seven emotions are characterized by the disruption of qi and direct injury to the internal organs. On the basis of the physical factors, the seven emotions cause qi depression, and then qi depression, and the typical mental symptoms of depression occur when qi depression occurs, and qi depression and qi depression affect each other, making the disease lingering and difficult to heal. Since the movement of qi involves various functions of the internal organs of the body, qi depression is also an important pathological mechanism that causes the somatic symptoms of depression. The occurrence of depression is mostly caused by internal factors, i.e., the seven emotions, which include changes in the seven emotions of happiness, anger, sadness, thought, grief, fear and fright. People often experience changes in the seven emotions in daily life, which are different reflections of objective external things and are normal mental activities, as well as normal physiological phenomena of the human body, and generally do not cause disease. Only under the sudden, strong or long-term persistent emotional stimulation, will affect the normal physiology of the human body, so that the internal organs of Qi and blood function disorders, resulting in the occurrence of disease, as: “anger hurts the liver, happy sad, thought hurt the spleen, worry hurt the lungs, fear hurt the kidneys. This means that the mental state of a person reflects and embodies his or her mental and psychological activities, and the health of mental and psychological activities directly affects the development of mental illnesses, which can also be said to be the key to the development of mental illnesses. Therefore, Chinese medicine believes that the relationship between mental activity and depression is very close, and it is not unreasonable to attribute the cause of depression to the seven emotions, so it is particularly important to regulate the spirit and nourish the body for friends suffering from depression. Modern psychiatry has found that the metabolites of dopamine and 5-hydroxytryptamine in the cerebrospinal fluid of depressed patients are low in spring and high in summer; the lowest value is in the spring and autumn dichotomy, and the highest value is in the winter and summer dichotomy, while the above rhythm is obviously disturbed in depressed patients. In addition, the peak concentrations of morphine-like peptides in the CSF of depressed patients were in late August and late October, respectively, with low values in spring, similar to the seasonal changes in the frequency of depression onset and suicide. It is induced by the disturbance of the seasonal rhythm of neurotransmitters, neuropeptides and other active substances in the brain in spring, which is the psycho-affective manifestation of the inability of the physiological activity of the central nervous system to adapt to the natural seasonal changes.