Morning sickness is a common symptom of pregnancy and is marked by nausea and occasional vomiting. Despite the name, morning sickness can cause discomfort at any time of the day.
According to the National Institutes of Health (NIH), most pregnant women experience nausea, but one-third also experience vomiting (NIH, 2011). Morning sickness usually happens within the first four months of pregnancy and is often the first sign that a woman is pregnant.
There are various ways to alleviate morning sickness, and complications are rare.