Morning sickness is nausea that occurs during pregnancy. Morning sickness affects a large proportion of pregnant women. It is most common during the first trimester. It is most common during the first trimester. Feeling sick is a sign that pregnancy hormones are high enough to sustain a pregnancy. Women who experience morning sickness are less likely to have a miscarriage than those who don't. Hormonal changes of pregnancy are thought to play a role. Hormonal changes of pregnancy are thought to play a role. Rarely, severe or persistent nausea or vomiting may be caused by a medical condition unrelated to pregnancy such as thyroid or liver disease.
Being stressed or overly tired, eating certain foods and traveling (if you’re likely to have motion sickness) may make the morning sickness worse. Treatment isn't necessary for most cases of morning sickness. If your morning sickness symptoms persist, however, your pregnancy care provider may prescribe vitamin B-6 supplements, antihistamines and possibly anti-nausea medications. In most cases, these symptoms go away by the 12th week of pregnancy. A few women, however, have some symptoms throughout their pregnancy.