A phenomenon associated with being pregnant in which the mother of the unborn baby may experience episodes of nausea, heartburn, dizziness or vomiting. Contrary to its description, this affliction can happen at any time of day or night.

It is widely attributed to the fluctuation of hormones during early gestation, but is not always limited to the first trimester. Additional possible causes can be hunger, stress, dehydration or certain sights and smells.

It is interesting to note that sometimes people in frequent close contact with the pregnant mother may exhibit symptoms of sympathetic morning sickness.