DEAR MAYO CLINIC: I am newly pregnant and not looking forward to the terrible morning sickness I experienced with my first two pregnancies. There were weeks when it felt like I could not keep any food down. What causes morning sickness? Is there any way to prevent it? At what point should I be seen by a physician?
ANSWER: It is not clear what causes morning sickness — the nausea and vomiting many women have during pregnancy. There are home remedies you can try that may help. If you start to lose weight, if you can’t keep liquids down or if vomiting becomes severe, see your doctor right away.
Although it is called morning sickness, that term is not accurate, as the symptoms can happen any time and, in some women, may last all day. Morning sickness is most common during the first trimester. But when it starts and how long it lasts can vary quite a bit. In a small number of cases, morning sickness can be an issue throughout pregnancy.