It is estimated that we have around 50,000 thoughts per day, a constant stream of positive, negative, weird, and wonderful thoughts.
There is a claim that we process 70,000 thoughts in a day.
- Mental Health Stories
For someone who is suffering from depression, it is common that thoughts are non-stop, even when you are trying to concentrate on other tasks.
The human mind is something scientists are still trying to figure out. We still do not quite understand where feelings and emotions come from.