Morning nausea can be caused by many factors beyond pregnancy. Common reasons include fatigue or poor sleep, hunger or dehydration, high or low blood sugar levels, acid reflux or GERD, stress or anxiety, inner ear issues, certain medications or supplements, high or low blood pressure, congestion or postnasal drip, gastroparesis, food poisoning, peptic ulcers, constipation, migraines, and even hormone fluctuations, particularly the stress hormone cortisol. Sometimes it is simply the effect of stomach acid building up overnight or the position of lying flat, which can cause stomach contents to move upwards and induce nausea. If the nausea is persistent or accompanied by other symptoms such as vomiting, significant abdominal pain, or weight loss, consulting a healthcare professional is advisable for proper diagnosis and treatment. These causes show that morning nausea can stem from a wide range of physiological and lifestyle factors, many of which can be addressed with changes in diet, hydration, sleep habits, or medical treatments if necessary.