What are the warning signs of depression?

According to the DSM there are 7 symptoms of depression

1. Severe sadness

2. Anhedonia

3. psychomotor retardation

4. eating disturbances

5. sleep disturbances

6. concentration problems

7. suicidal

5 out of these 7 symptoms must be present for at least 2 weeks in order for there condition to be classified as depression.