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Published on: 4/7/2025

When Does Morning Sickness Typically Start During Pregnancy?

Morning sickness usually begins around 4 to 6 weeks of pregnancy and is most common during the early part of the first trimester.

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Explanation

Many pregnant people notice the beginning of morning sickness between 4 and 6 weeks after their last menstrual period. This time frame marks the early stages of pregnancy when the body is adjusting to important changes. Although it's called "morning sickness," the upset stomach and nausea can happen at any time of the day. For most, these symptoms are mild to moderate and usually settle down by the end of the first trimester. However, every person is different, and the start and severity of morning sickness can vary. Some might feel it a little earlier or later, but this period is the typical time when hormonal changes lead to nausea and sometimes vomiting. If the symptoms become very intense or interfere with your daily activities, it's important to speak with a healthcare provider to make sure everything is okay.

(References)

  • Chan RL, Olshan AF, Savitz DA, Herring AH, Daniels JL, Peterson HB, Martin SL. Maternal influences on nausea and vomiting in early pregnancy. Matern Child Health J. 2011 Jan;15(1):122-7. doi: 10.1007/s10995-009-0548-0. PMID: 20012346; PMCID: PMC4182010.

  • Festin M. Nausea and vomiting in early pregnancy. BMJ Clin Evid. 2014 Mar 19;2014:1405. PMID: 24646807; PMCID: PMC3959188.

  • Mother To Baby | Fact Sheets [Internet]. Brentwood (TN): Organization of Teratology Information Specialists (OTIS); 1994-. Nausea and Vomiting in Pregnancy (NVP) 2024 Feb.Available from: https://www.ncbi.nlm.nih.gov/books/NBK582541/

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