Mental depression is a normal negative emotion that people experience when they experience bad things. However, people may suffer from depression if they are depressed for a long period of time, for example, more than two weeks, or even if it affects the patient’s normal life, work, study, social life, etc. The causes of depression are more complex and are the result of a combination of factors. For example, it may be related to family genes. Patients may be timid, weak and cautious, and will not easily express their thoughts and emotions. They may easily retreat from things, think of things in a bad way, be pessimistic and have low self-confidence. If the patient has experienced a lot of bad stressful life events, such as the serious illness (or even death) of a loved one, encountering betrayal, divorce, etc., it will cause the patient to be stressed out and emotionally depressed for a long time, and he or she will easily suffer from depression.