Our expert says:
Nausea can be caused by phlegm irritating the stomach lining (like if one develop a post nasal drip) or due to inflammation of the stomach lining (gastritis) which can be caused by stress,smoking or alcohol use; or due to vertigo (middle ear infection), hormonal causes (high progesterone), bile reflux into the stomach (diet related), certain medications, migraine etc. If it persists you maybe need to see your GP to check a few basic things.
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