In today’s society, everyone is more or less depressed when they are bored. Although depression is not the same as depression, it can slowly turn into depression if it develops in the long run. Depressive episodes can affect a person’s appetite, and loss of appetite is also a very obvious manifestation of the dangers of depression. Depressive episodes can also have a negative impact on a person’s sleep. The danger of depression is manifested in all aspects of daily life and should not be underestimated. We can only promote the prevention and treatment of depression if we are clear about “what are the hazards of depression”. First, the danger of depression is manifested in the decline of physical functions: after suffering from depression, usually manifested as difficulties in thinking, sleep disorders, decreased appetite, brain work efficiency decreased significantly, it is difficult to perform daily work, but also the human immune function decreased, so that social work and physiological ability decreased. Second, the quality of sleep decreases, prone to sleep disorders: depressed patients often have persistent sleep disorders, the incidence of up to 98%, manifested as insomnia, difficulty falling asleep, early awakening, sleep rhythm disorders, poor sleep quality and other forms. Depressed patients often can’t sleep all night, and even if they fall asleep, the sleep time is very short. Early awakening is the most prominent among sleep disorders, which is also one of the characteristic symptoms of depression. Third, there are strong suicidal impulses: suicidal attempts and behaviors are the most dangerous symptoms in patients with severe depression. It can appear in the severe stage of symptoms, but also in the early stage or when it gets better. People call depression “the number one psychological killer of human beings” because no other mental illness or psychiatric disease has such a high suicide rate. Severe psychological disorders: People with depression will magnify things and create many psychological disorders for themselves. They are often very dissatisfied with themselves and the outside world, leading to sullenness and diminished interest of patients, and in severe cases, pain and days, which will lead to a vicious circle. Five, leading to a variety of diseases: depression in severe cases can appear hallucinations, delusions, anxiety and motor agitation, and even the occurrence of wood stiffness, resulting in loss of appetite, fatigue and other physical symptoms, and these symptoms continue for a long time will also lead to various parts of the body organs of disease.