I'm interested in studying in this field. It's something that has interested me since a long time. My sister has a problem where, whenever she is nervous or scared, she gets sick to her stomach. She develops nausea and vomiting. So when she has an exam, she's sick. If she has to speak in front of class, she's sick and just about everything in between. I want to study physiological psychology to understand why this happens to her.
Why does it happen to some people and not others? What makes some people so sensitive that their thoughts cause physical reactions in their body?