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.
