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When Does Morning Sickness Start?

Morning sickness is one of the earliest and most recognisable signs of pregnancy, yet its timing varies widely from woman to woman. Understanding when it typically begins can help you prepare and know what to expect in the first few weeks.

Table of Contents

  1. When Does Morning Sickness Usually Start?
  2. What Causes It to Begin?
  3. Early Signs to Look For
  4. When to Expect Relief
  5. FAQ

When Does Morning Sickness Usually Start?

For most women, morning sickness begins between weeks 4 and 6 of pregnancy, often around the time you would expect your period or shortly after a positive test. It rarely starts before week 4, as hormone levels are not yet high enough to trigger symptoms. By week 8, most of those who will experience nausea have noticed it. A small number of women never feel nauseous at all, and this is also completely normal.

What Causes It to Begin?

The main driver is rising human chorionic gonadotropin (hCG), the hormone detected by pregnancy tests. hCG rises rapidly in early pregnancy and is thought to affect the brain nausea centres. Oestrogen and progesterone also increase and may contribute, as can heightened smell sensitivity and changes in digestion. The exact mechanism is not fully understood, which is why severity and timing vary so much.

Early Signs to Look For

Nausea is the hallmark, but it does not always involve vomiting. You may notice food aversions, a metallic taste, increased sensitivity to smells, or loss of appetite. Some women feel queasy mainly in the morning, while others experience it in the afternoon or evening despite the name. Fatigue and mild dizziness often accompany these early symptoms.

When to Expect Relief

For most women, symptoms peak around weeks 8 to 10 and ease by the end of the first trimester, around week 12 to 14. A minority continue to feel nauseous into the second trimester, and a small number experience it throughout pregnancy. If nausea is severe, prevents you from keeping food or fluids down, or causes weight loss, speak to your midwife or GP promptly, as this may be hyperemesis gravidarum.

FAQ

### Can morning sickness start before a positive test?

It can, occasionally, around the time of a missed period, but most women notice it after a positive result. Very early nausea is more likely due to other factors.

Does no morning sickness mean something is wrong?

Not at all. Some healthy pregnancies have no nausea at all. Every body responds differently to pregnancy hormones, so the absence of symptoms is not a cause for concern on its own.

When should I tell my midwife about nausea?

Mention it at your booking appointment, but contact your GP sooner if you cannot keep fluids down, are losing weight, or feel dizzy and weak.

This article is for informational purposes only and does not constitute medical advice.

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