Published on: 4/7/2025
Morning sickness can start as early as around 4 weeks after your last menstrual period, but most women begin to notice it between 4 and 6 weeks. However, the timing can vary from one pregnancy to another.
During early pregnancy, hormonal changes in your body can create nausea and vomiting, commonly known as morning sickness. Some women may notice these symptoms as early as 4 weeks after their last menstrual period. This timeline can mean that by the time you realize you’ve missed a period, you might already be experiencing some nausea. For many women, morning sickness becomes more noticeable around 4 to 6 weeks, with the intensity varying from one person to another. The experience of morning sickness is unique; some may feel it right away while others might not notice it until a bit later. Factors such as individual hormone levels and overall sensitivity to these changes can influence when and how severely it starts. If your nausea is unusual, very severe, or is accompanied by other worrying signs, it’s a helpful idea to speak with your healthcare provider. They can offer guidance and ensure you and your baby remain healthy during this exciting time.
(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.
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