What causes morning sickness?
Several hormonal and physical changes contribute to pregnancy nausea. Rising levels of human chorionic gonadotropin (hCG) and estrogen play a major role. New research shows that morning sickness may also be linked to GDF15, a hormone produced in the placenta that increases substantially during pregnancy.
Progesterone also relaxes smooth muscle tissue, which slows digestion and can lead to bloating and queasiness. Many women also notice a heightened sense of smell during early pregnancy, which can make certain odors an instant trigger.
Low blood sugar, fatigue, and stress can make nausea worse. That is why symptoms often feel strongest when you are hungry, overtired, or rushing through the day.
What normal pregnancy nausea looks like
Even when it is uncomfortable, normal morning sickness usually allows you to keep some food and fluids down. You might notice nausea that comes and goes throughout the day, food aversions, sensitivity to certain smells, occasional vomiting (especially in the morning), or symptoms that fluctuate from one day to the next.
If you can stay hydrated, urinate regularly, and keep down at least some food, you are likely in a good position to manage things with supportive strategies at home. Discussing your symptoms during a prenatal care visit can also help you feel more confident about what to expect.
Eating habits that can help
An empty stomach is one of the most common nausea triggers. Eating small amounts frequently throughout the day tends to work better than eating three larger meals. Try eating something bland within 15 minutes of waking up, even just crackers or dry toast. Keep snacks nearby so you can eat before nausea builds, and aim for something every two to three hours. Having a snack containing protein before bed and again first thing in the morning can also help.
Stick with foods that are easy to tolerate: plain carbs like rice or potatoes, simple proteins like eggs or yogurt, and cold options like smoothies or fruit. Ginger tea and ginger chews also work well for many women. Do not worry about eating a perfectly balanced diet right now. The goal is to find foods you can keep down and build back variety as symptoms ease. For more guidance on what to eat while pregnant, read our post on nutrition in pregnancy.
Staying hydrated when drinking water feels impossible
Dehydration makes nausea worse, but drinking a full glass of water at once can trigger vomiting. Small sips taken consistently throughout the day tend to be more manageable. Cold fluids, ice chips, and popsicles are often easier to tolerate than room-temperature water. If you are vomiting frequently, electrolyte drinks can help replace what you are losing.
Try separating fluids from meals if drinking during eating makes things worse. Signs of dehydration to watch for include darker urine, lightheadedness, and urinating fewer than three to four times a day.
Lifestyle adjustments worth trying
Fatigue makes nausea harder to manage, so prioritize sleep and short rest breaks when possible. Getting fresh air, keeping your space well-ventilated while cooking, and avoiding overheating can all help. After vomiting, rinsing your mouth or brushing your teeth can reduce lingering taste triggers. Carrying mints or gum can also provide quick relief. For additional ways to support your wellbeing throughout your pregnancy, see our tips on staying healthy during pregnancy.
Safe remedies to ask your provider about
Some women manage nausea with lifestyle changes alone, while others need additional support. Common pregnancy-safe options include vitamin B6 supplementation, doxylamine (often combined with B6), and prescription anti-nausea medications for more severe symptoms. Talk to your OB provider before starting any supplement or medication, especially if you have other medical conditions.
When nausea may be something more serious
Hyperemesis gravidarum is a condition involving severe nausea and vomiting that can lead to dehydration, weight loss, and electrolyte imbalances. It is not the same as typical morning sickness and often requires medical treatment.
Call your provider if you experience vomiting that prevents you from keeping fluids down for more than 12 to 24 hours, signs of dehydration like dark urine or infrequent urination, dizziness or fainting, weight loss of more than a few pounds in a short period of time, vomiting blood or material that looks like coffee grounds, or severe weakness that interferes with daily activity.
If you are unsure whether your symptoms are typical, it is always better to call early rather than wait until you feel depleted.
When to schedule an appointment for pregnancy nausea
If morning sickness is interfering with your ability to eat, stay hydrated, work, or rest, The Ob-Gyn Center can help. Our team can evaluate your symptoms, recommend safe options for relief, and create a plan that supports both your comfort and your pregnancy. You should never feel like you have to wait until things get severe to ask for help. If you are planning a future pregnancy and want to prepare ahead, preconception counseling can help you go in with a plan.
