For some, it's simply a food aversion, a strong response to specific scents or tastes, while others have occasional queasiness, which frequently begins in the morning and ends after lunch. Unfortunately, for some, it's an overpowering feeling that persists throughout the day, with waking (and sometimes sleeping) hours with recurrent episodes of vomiting. https://www.manipalhospitals.com/hebbal/blog/managing-morning-sickness-and-solutions/