When does morning sickness start? An OB explains
Board-certified OB-GYN Dr. Ranae Yockey explains what’s normal, what’s not, and how to find relief.
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Morning sickness in pregnancy is incredibly common—up to 80% of pregnant people report experiencing it. According to the American College of Obstetricians and Gynecologists (ACOG), morning sickness usually begins around week 6 of pregnancy. Symptoms typically peak around weeks 8 to 10.
To help make sense of the timeline—and what’s actually worth worrying about—we spoke with Dr. Ranae Yockey, a board-certified obstetrician and gynecologist who serves as program director of midwifery services at Northwest Community Hospital. Below, she walks us through when morning sickness starts, what’s normal, what’s not, and how to manage the nausea so you can get through your day.
Although the exact cause of morning sickness is unknown, it is believed to be linked to the drastic hormonal changes—including a surge in human chorionic gonadotropin (hCG) and estrogen—that take place during the first trimester. Nausea (that can sometimes lead to vomiting) can occur in brief periods throughout the day, not just in the morning like the name implies.
Interestingly, some researchers believe morning sickness may actually serve a protective purpose. Evolutionary biologists have found that nausea and food aversions peak precisely when fetal organ development is most vulnerable to disruption, and that pregnant people who experience morning sickness may have a lower risk of miscarriage. You can read more about the evolutionary theory behind morning sickness here.
Related: The new mama’s guide to pregnancy symptoms
Can you be nauseous at 2 weeks pregnant?
Technically, yes—though it’s uncommon. Most people start noticing nausea closer to weeks 4 through 6, when hCG levels begin climbing rapidly. That said, some people report mild queasiness very early on, even before a missed period. A 2021 study found that nausea symptoms may begin earlier than previously thought, possibly as soon as week 2 or 3 after ovulation.
If you’re feeling off at 2 weeks, it could be early pregnancy—but it could also be PMS, stress, or something else entirely. A pregnancy test after a missed period is the most reliable way to know for sure.What are the symptoms of morning sickness?
You’ll know you have morning sickness if you experience the following within the first trimester of pregnancy:
- Nausea (ranging from mild queasiness to all-day waves)
- Vomiting
- Dizziness
- Food aversions that limit what you can eat
- Sensitivity to certain smells that triggers nausea or vomiting
- Heartburn or reflux
Morning sickness can look and feel different from person to person—and even from pregnancy to pregnancy. Some people describe it as feeling like motion sickness, while others say it’s more like persistent hunger pangs. If you want to hear what the experience is really like from someone in the thick of it, check out one mom’s first-trimester morning sickness story.
Related: 4 lies I believed about morning sickness—until I had it myself
Does everyone get morning sickness?
No. While morning sickness is very common, it’s not universal. Research estimates that about 70 to 80% of pregnant people experience some degree of nausea in the first trimester, which means roughly 20 to 30% of pregnancies come with little to no nausea at all. If you’re not feeling sick, that doesn’t mean something is wrong—plenty of people have perfectly healthy pregnancies without a single wave of queasiness.
On the flip side, some people experience much more intense symptoms than others. Risk factors for more severe morning sickness include carrying multiples, a family history of heightened symptoms, a personal history of motion sickness or migraines, and being pregnant for the first time.
What’s the worst week for pregnancy nausea?
For most people, morning sickness is at its worst around weeks 8 to 10 of pregnancy, when hCG levels are at their highest. You may notice a ramp-up starting around week 6, with symptoms intensifying through weeks 8 and 9 before they begin to level off. Dr. Yockey notes that the peak can feel different for everyone—some people have a clear worst week, while others feel generally lousy for several weeks running.
The good news: for most people, the worst of it is concentrated in a relatively short window, and symptoms usually start improving noticeably by weeks 12 to 14.
When are my symptoms considered abnormal?
Although you should always consult with your doctor if you have concerns about your pregnancy, there are some factors that can make morning sickness more intense, including having a family history of heightened symptoms, carrying multiples, or having a medical history that includes motion sickness and migraines.
If symptoms are severe enough, you could be developing hyperemesis gravidarum (HG). You may have heard of this when Kate Middleton was going through it with each of her pregnancies.
Although HG is rare (affecting roughly 1 to 3% of pregnant people), severe nausea and vomiting throughout pregnancy can lead to significant weight loss (more than 5% of pre-pregnancy body weight), dehydration, and electrolyte imbalances.
Dr. Yockey explains that hyperemesis gravidarum can have effects well beyond the physical. “Thirty-five percent of patients require time off of work, 50% say that their family and partner relationships are affected, 55% say they’re depressed,” she wrote. She adds that roughly 7% of HG patients experience long-term psychiatric effects or PTSD from the severity of the condition. Some of her patients have required multiple hospitalizations and home IV therapy throughout their entire pregnancies, and some have ultimately terminated pregnancies because of the impact on their work, health, and relationships.
Related: A nutritionist’s guide to the best foods for pregnancy, from the early days to the third trimester
When does morning sickness end?
This is the question every nauseous pregnant person is desperately Googling—and the answer is encouraging. Though there are exceptions, most people will see their symptoms ease significantly by 14 weeks of pregnancy, which marks the transition into the second trimester. Dr. Yockey says that 90% of the time, symptoms will resolve entirely by 22 weeks.
For some people, morning sickness fades gradually over a few weeks. For others, it feels like a switch flipped. In rare cases—particularly with hyperemesis gravidarum—nausea can persist well into the second or even third trimester and may require ongoing medical management.
Related: Probiotics in early pregnancy could help relieve morning sickness
How is morning sickness treated?
NVP (nausea and vomiting of pregnancy) can be tough to push through—it takes a real toll on emotional, psychological, and physical health. While there is no cure for morning sickness, there are evidence-backed strategies that can help take the edge off. Here’s what Dr. Yockey and other experts recommend:
- Take anti-nausea meds. Dr. Yockey emphasizes that even when symptoms are severe, medications like Zofran or the FDA-approved combination of doxylamine and pyridoxine (Diclegis) can help. Talk to your OB about what’s right for you.
- Try vitamin B6, which has been shown to decrease nausea and vomiting in pregnancy. Many prenatal vitamins contain it, but if you’re still struggling, a separate B6 supplement may help. Ask your doctor about dosage.
- Stock up on ginger chews and cook more with ginger, which has historically helped with nausea in traditional medicine.
- Take probiotics. A small study found that people who took Lactobacillus probiotics in early pregnancy reported reduced morning sickness symptoms.
- Try acupuncture or acupressure. Some studies suggest these methods may help ease nausea and vomiting.
- Eat small, frequent, bland meals every 1 to 2 hours. Dr. Yockey notes that nausea is often worse when your stomach is completely full or completely empty.
- Avoid strong odors, spicy foods, and sugary foods, which can trigger or worsen nausea.
- Stay well-rested and hydrated. Dehydration and fatigue are common nausea triggers.
For more practical strategies, check out 12 steadying strategies for morning sickness that actually help.
When to contact your doctor about morning sickness
Morning sickness is normal. Suffering in silence is not. Dr. Yockey stresses that early intervention can actually help prevent mild nausea from progressing into something more severe, so don’t wait until you’re in crisis to reach out to your provider.
Call your doctor or midwife if you experience any of the following:
- You are vomiting three or more times per day and unable to keep food or liquids down.
- You notice signs of dehydration: dark urine, dizziness when standing, urinating fewer than three times a day.
- You’re losing weight (more than 2 pounds in a week or 5% of your body weight overall).
- Your vomit contains blood or looks like coffee grounds.
- You feel extremely fatigued, confused, or faint.
- Your heart is racing or pounding.
- Your nausea and vomiting are not improving with home remedies.
- Your symptoms persist well beyond the first trimester (past 14 to 16 weeks) or are getting worse instead of better.
Your provider can help figure out the best course of action, whether that’s adjusting your diet, trying medication, or monitoring you for hyperemesis gravidarum. As Dr. Yockey puts it: “Early diagnosis and treatment may decrease the progression to hyperemesis gravidarum.” There’s no reason to tough it out alone—your care team is there to help.
And above all: always reach out to your OB or midwife anytime something feels off during pregnancy. Your concerns are always worth a phone call.
A version of this story was originally published on Oct. 16, 2021. It has been updated.
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