Our cheeks turn red from embarrassment, our hands tremble from stress and our stomachs can hurt. After a meeting with friends full of jokes and laughter, we feel relaxed, and we may even react to the worst news with a fainting spell or even the proverbial "heart attack". Emotions are inextricably linked to our body and can have a very strong impact on its reactions and overall functioning, thus having a complex effect on our overall health.