I have a friend that is expecting her baby number 2. She is only a few weeks a long though and hasn’t yet entered the stage where symptoms come into play. We were talking about the morning sickness she had during her first pregnancy and whether she would get it again this pregnancy. That of course let to what actually causes morning sickness. I have never really thought much on it before and spouted off the typical scenarios/reasons that most people do. Then I of course looked into it and found that there may be more to that morning sickness. Mommypotmus gives us the real cause of morning sickness.