Answers:
I have to combine two different websites to receive the most complete explanation. They are :
http://en.wikipedia.org/wiki/mind...
http://www.surgerydoor.co.uk/medical_con...
If you can shift to a library, in attendance is a great book which explains your mind's affect on your form : When the Body Says No: Understanding the Stress-Disease Connection by Gabor Maté
Good Luck !