Most people think depression is a manifestation of low mood, in fact, depression has many kinds of manifestations, the most core symptoms are: 1, low mood, no interest in doing anything, unhappy and sullen every day; 2, a decline in interest in doing things, the things you used to like to do now do not like, or the things you used to do very well, now also do not want to do; 3, a decline in willpower, do not have the spirit of doing anything, even eating 4, other physical symptoms, such as headache, dizziness, limb weakness and other physical symptoms; 5, appetite will change, no appetite for food, eat anything feel unpleasant; 6, some patients even appear sexual function decline, women manifest as menstrual cycle disorders, men may have a decline in sexual function. There will also be symptoms of irritability and anger, and even more serious patients will have suicidal thoughts, feeling that there is no point in living, wanting to die or even having suicidal behavior. If any of these symptoms occur, it is important to pay high attention to see if depression occurs.