When you have morning sickness..... but you're not pregnant: Doctors explain the OTHER reasons why people wake feeling ill

Feeling nauseous in the morning usually rings alarm bells for women - or sparks office rumours.
But morning sickness does not necessarily mean you are pregnant, according to leading doctors.
AMA Council of General Practice chair Dr Brian Morton told Daily Mail Australia that morning sickness can also be caused by other factors - including hormonal imbalance, reflux, sleep apnoea, stress or depression.
Dr Morton said the release of hormones from the brain determined whether we were a morning or night person. He said feelings of nausea could be caused by the brains inability to release natural hormones, such as adrenalin or serotonin, when you wake up in the morning. ‘Our day/night rhythm is slightly different for different people,’ he said. 'For women too it can be a change in hormone levels during the month.' Source