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What is depression?
2026-04-05 16:33:25
What is depression?
Depression is a common mental health problem characterized by persistent low mood, loss of interest, lack of energy, and even physical symptoms such as insomnia or changes in appetite. It is different from short-term mood swings, but has a long-term impact on an individual's thinking, behavior and quality of life. This article will expand on the definition, symptoms, causes, coping methods and social support of depression to help readers fully understand this psychological state.
Core symptoms and manifestations of depression

Core symptoms of depression include low mood that lasts for more than two weeks, loss of interest in daily activities, and a significant decrease in energy. Patients may feel worthless, blame themselves, or even experience suicidal thoughts. Physiologically, it may be accompanied by sleep disorders (such as insomnia or hypersomnia), significant changes in weight, and difficulty concentrating. According to data from the World Health Organization (WHO), about 3.8% of the world's population suffers from depression, with the prevalence rate among women being higher than among men. It should be noted that depression is not a "weak character" but the result of a combination of factors.
Causes of depression: biological, psychological and social factors
The causes of depression are complex and usually involve biological, psychological and social aspects. Biological factors include genetic predispositions and imbalances in brain chemicals (such as serotonin); psychological factors such as long-term stress, traumatic experiences, or negative cognitive patterns; and social factors including interpersonal tensions and financial difficulties. For example, the "learned helplessness" theory proposed by American psychologist Martin Seligman believes that long-term inability to control negative events may induce depression. In addition, chronic illness or medication side effects may also be triggers.
How to deal with depression? Professional treatment and self-regulation
Dealing with depression requires a combination of professional treatment and self-regulation. Mild depression can be improved through psychological counseling (such as cognitive behavioral therapy) or lifestyle modification (regular exercise, social activities); moderate and severe depression may require pharmaceutical intervention, such as selective serotonin reuptake inhibitors (SSRIs). Well-known antidepressant drugs include Pfizer’s “Sertraline” (trade name Zoloft) and Eli Lilly’s “Fluoxetine” (trade name Prozac). At the same time, the understanding and support of family and friends is crucial. Avoid isolating or blaming the patient and instead encourage them to seek professional help.
Summary: Pay equal attention to understanding and action
Depression is an intervenable mental health problem that needs to be treated scientifically without prejudice. Early recognition of symptoms and prompt medical treatment are key. Society should strengthen mental health education and reduce stigma. If you or someone around you has related symptoms, you can call the psychological assistance hotline or consult a psychiatrist. Remember, depression is not invincible, and with the right approach, most sufferers can significantly improve their quality of life.
| data item | content |
|---|---|
| Global prevalence of depression | About 3.8% (WHO 2021 data) |
| Common antidepressants | Sertraline (Pfizer), Fluoxetine (Eli Lilly) |
Quote sources:
1. World Health Organization (WHO) "Mental Health Report 2021"
2. Martin Seligman’s “Learned Helplessness” Theory
3. American Psychiatric Association (APA) Depression Diagnosis and Treatment Guidelines
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