People Pleasing Behavior - What Causes It?

Psychologists have found heaps of known links between people pleasing and disorders like social anxiety, OCD and depression. So where does this type of behavior come from? I want to jump into some very interesting links later on mainly around trauma and gender. But before then let's talk about some of the more typical causes of people pleasing behavior. People pleases have a need for external validation and may feel that doing things for others will lead to approval and acceptance.