Question: what are the causes of morning nausea?
Answer: Pregnancy. Nausea and vomiting are among the earliest signs of pregnancy, appearing around the sixth week. ... 
Fatigue or sleep issues. ... 
Hunger or low blood sugar. ... 
Acid reflux. ... 
Postnasal drip or sinus congestion. ... 
Anxiety. ... 
Hangover. ... 
Diet.