1. Feeling down, frustrated or desperate: Some people use "a haze, like the gloomy weather before it rains" to describe their inner emotions.

2. Lack of enthusiasm or interest in doing things: Things that once interested you no longer interest you, and even if you do it reluctantly, there is no fun at all.

3. Sleep problems: including difficulty falling asleep, restless sleep, waking up early or sleeping too much.

4. Feeling tired or lack of energy: Depression makes people feel that they have lost energy and have no motivation to do things.

5. Loss of appetite or eating too much: Eating problems are often accompanied by significant weight loss or weight gain.

6. Feeling bad or a failure, or thinking that you have let your family down.

7. Inability to concentrate: It is difficult to concentrate on doing things, and often "distracts" when watching TV or reading newspapers.

8. Speaking and doing things become obviously slower: A severely depressed person is like a rusty machine. Although no part is broken, the overall operation fails.

9. Pessimistic thoughts: It is better to die or harm yourself in some way. In severe cases, you may commit suicide.

10. Affect physiological functions: symptoms such as dizziness, headache, palpitations, sweating, sensitivity to cold and heat, numbness of the skin, frequent urination and urgency.