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    When Does Morning Sickness Start After Conception?

    Updated 09 January 2023 |
    Published 12 February 2019
    Fact Checked
    Reviewed by Irina Ilyich, Flo lead medical advisor, Lithuania
    Flo Fact-Checking Standards

    Every piece of content at Flo Health adheres to the highest editorial standards for language, style, and medical accuracy. To learn what we do to deliver the best health and lifestyle insights to you, check out our content review principles.

    Morning sickness — the nausea and vomiting that some pregnant people experience — is a common symptom of pregnancy. Affecting about 80 percent of pregnant people, morning sickness is often one of the earliest symptoms of pregnancy. Thankfully, this uncomfortable condition can be managed with some self-care tips. 

    Despite its name, “morning” sickness can happen at any time of the day. But when does morning sickness usually start, and what are its causes and treatments? These are some of the questions we will answer today, so read on.

    Why people feel morning sickness

    Medical researchers haven’t figured out exactly why morning sickness happens. However, the body’s reaction to the pregnancy hormone human chorionic gonadotropin (hCG) has been suggested as a possible cause. This hormone is produced after the fertilized egg attaches to the lining of the uterus.