Risk factors

Morning sickness can affect anyone who's pregnant, but it might be more likely if:

• You had nausea or vomiting from motion sickness, migraines, certain smells or tastes, or exposure to estrogen (in birth control pills, for example) before pregnancy
• You had morning sickness during a previous pregnancy
• You're pregnant with twins or other multiples

You might be more likely to experience hyperemesis gravidarum if:

• You're pregnant with a girl
• You have a family history of hyperemesis gravidarum
• You experienced hyperemesis gravidarum during a previous pregnancy