Morning sickness is common nausea, dry heaves, retching, or vomiting during pregnancy. Despite its name, it can happen at any time of day or night—not only in the morning. It often improves by the early second trimester, but symptoms vary widely. Severe vomiting or trouble keeping fluids down needs prompt advice from your maternity clinician.
What “morning sickness” can feel like
Nausea and vomiting in pregnancy can range from mild queasiness to more disruptive symptoms. About 80% of pregnant people experience some nausea or vomiting, but not everyone does.
Symptoms may include:
- Nausea
- Dry heaves or retching
- Vomiting
- Symptoms that come and go, or occur at different times of day
Having nausea does not confirm that a pregnancy is healthy, and having no nausea does not mean something is wrong. Symptoms alone cannot tell you how a pregnancy is progressing.
The usual timeline—and when to check in
Pregnancy nausea and vomiting commonly follow an early-pregnancy pattern:
- Starts: usually between weeks 4 and 9 of pregnancy
- Often feels strongest: around weeks 7 to 12
- Often improves: between weeks 12 and 16; for many people, it is gone by week 14
Some people have symptoms for longer—up to 20 weeks or, less commonly, throughout pregnancy.
If nausea or vomiting first begins at 10 weeks or later, discuss it with a healthcare professional. Other conditions can cause nausea and vomiting during pregnancy, especially when the timing or symptoms do not fit the usual pattern.
Why it happens
There is no single proven cause of morning sickness. Rapidly rising pregnancy hormone levels, including human chorionic gonadotropin (hCG), are believed to contribute, but they do not fully explain why symptoms differ so much from person to person.
This is not something you caused or failed to prevent.
Some factors may make severe pregnancy nausea and vomiting, including hyperemesis gravidarum, more likely. These include carrying twins or more babies, having had hyperemesis gravidarum in a previous pregnancy, and being prone to motion sickness. These factors raise likelihood; they do not mean severe symptoms will happen.
Practical ways to manage mild nausea
Self-care measures may make manageable symptoms easier for some people. They are not a substitute for medical assessment when vomiting is severe or fluids will not stay down.
Try a few approaches rather than changing everything at once:
- Eat small amounts often. Small meals or snacks every one to two hours may help. If it works for you, adding a protein source to meals and snacks may also be useful.
- Adjust how you drink. Cold or partially frozen fluids may be easier to tolerate. Some people find it more comfortable to drink 20 to 30 minutes before or after eating instead of with a meal.
- Keep track of what stays down. A simple note can help: when nausea is worst, what you have been able to eat or drink, and whether symptoms are changing.
- Consider your prenatal vitamin with your clinician. Iron in prenatal vitamins can worsen nausea, upset the stomach, or cause constipation for some people. Do not stop a prenatal vitamin on your own; ask whether changing the timing or formulation is appropriate.
The aim is not to force a perfect routine. For mild symptoms, focus on tolerable food and fluids while watching for signs that you need more support.
Vitamin B6, doxylamine, ginger, and other treatment options
If food and fluid adjustments are not enough, contact your midwife, obstetrician, doctor, or pharmacist. Treatment is available, and you do not need to simply endure symptoms that are affecting your ability to eat, drink, sleep, work, or manage daily life.
Topics to ask about include:
- Vitamin B6 and doxylamine. Clinicians use these medicines for pregnancy nausea and vomiting. Research involving hundreds of thousands of women has not found an increased risk of birth defects with the doxylamine-pyridoxine combination during pregnancy. Read the MotherToBaby fact sheet on doxylamine-pyridoxine.
- Ginger supplements. Ginger supplementation may help some people with nausea, but the right formulation and whether it suits you are questions for a clinician or pharmacist.
- Prescription anti-nausea medicine. A maternity clinician can assess your symptoms and recommend an appropriate option when needed.
Do not start, stop, or change medicines or supplements based on general advice alone. Pregnancy-specific guidance matters, particularly if you have persistent vomiting or difficulty keeping anything down.
When morning sickness may be more serious
Hyperemesis gravidarum is the most severe form of pregnancy nausea and vomiting. It can involve persistent vomiting, dehydration, and weight loss. It needs clinical assessment—not self-diagnosis—because other conditions can also cause vomiting in pregnancy.
Call your maternity clinician promptly if
- Nausea or vomiting is affecting eating, drinking, sleep, daily activities, or simply feels concerning
- You have severe or persistent vomiting
- You cannot tolerate fluids for more than 12 hours
- You are losing weight, including more than 5 pounds (2.3 kg)
- There is blood in your vomit
- You have abdominal pain
Seek prompt assessment for possible dehydration
Contact your maternity clinician urgently if you have:
- Very little dark urine or cannot urinate
- Inability to keep liquids down
- Dizziness or fainting when standing
- A racing or pounding heartbeat
These symptoms may require treatment to restore fluids and control vomiting. In some cases, hospital treatment is needed when oral fluids or medicines cannot be tolerated.
A calm next-step checklist
For mild, manageable nausea, try small frequent snacks and a hydration approach that feels tolerable, such as cold fluids or drinks between meals. Keep note of fluid intake and whether symptoms are improving, staying the same, or worsening.
Call your maternity clinician promptly if you cannot keep fluids down, notice dehydration signs or weight loss, have severe or persistent vomiting, blood in vomit, abdominal pain, or any concern. Asking for help is appropriate—and treatment options are available.
