I've purchased an e-book by a guy who formerly suffered from SA. I'm obviously not allowed to upload it or copy/paste text from it, but I've made some notes myself. Maybe you can use some of this information?
The causes of SA:
It’s not a real illness – medication doesn’t help, and can only be a temporary fix
It’s not a personality trait – you’re not shy all the time
It’s a set of learned mental and physical behaviours you may use to react in certain situations – You can unlearn these behaviours and replace them with new ones
People with SA think / are scared that:
…someone will criticize or reject them based on their behaviour
…they will make a negative impression on someone
…someone will judge their actions negatively
…they are weak, inferior, inadequate or less good than others
…people will notice this defect and disapprove of them
They are scared of disapproval or rejection => they are quiet and withdrawn – they don’t want attention that could mean potential disapproval => people will not notice them and therefore not disapprove of them => the risk of disapproval can increase => the cycle starts over and gets worse
They are only more loud and outgoing in situations where disapproval is unlikely – with family or close friends – they know how the people will react to their actions
Fear of disapproval is a build-in survival mechanism:
Many of our behaviours are secretly driven by a subconscious need to survive and reproduce.
If a caveman was disapproved by his tribe, he would be kicked out, forced to be on his own and eventually die – therefore disapproval = death
Shyness is not always a problem, it can prevent us from doing things that could have severe consequences – but people with SA take it too
The Amygdala:
The Amygdala is a subconscious part of the brain that connects a certain stimulus to pain or pleasure – negative social feedback is registered as pain and therefore danger
A “fight or flight” response is activated, leading to symptoms such as rapid heart rate, trembling/shaking, short of breath, sweating, cold hands, blushing, etc.
Panic attack = the symptoms come very quickly and intensely