How long does morning sickness last?
Last updated September 3, 2026.
Morning sickness usually starts around weeks 4 to 7, peaks near week 9, and clears by weeks 16 to 20 - though a minority run longer, and a few have it to the end, usually milder. The shape matters more than the weeks: miserable nausea that still lets you eat and drink is the normal kind and does not harm the baby. The not-normal pattern is hyperemesis gravidarum: relentless vomiting, nothing staying down including fluids, dehydration signs, and weight loss - that needs medical treatment, sometimes hospital fluids, and will not resolve on ginger. Contact your midwife or doctor if you cannot keep fluids down for 24 hours or are losing weight. Pymander is a free AI doctor, 24/7 by text, and can help you judge your pattern.
What to do
- Hold on for weeks 16 to 20: most cases break by then.
- Track what stays down: fluids retained is the line between rough and risky.
- Know the hyperemesis signs: nothing stays down, dark little urine, dizziness, weight loss.
- Call your midwife or doctor early: 24 hours without fluids kept down is the prompt-call rule.
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