Pregnant individuals often wonder about the signs their bodies present as their due date approaches. While nausea and vomiting are commonly associated with early pregnancy, their appearance in later weeks can cause confusion about whether labor is beginning. Understanding these symptoms in late pregnancy helps differentiate normal physiological changes from labor signals.
Nausea and Vomiting as a Labor Sign
Nausea and vomiting can be experienced by some individuals approaching or entering labor, though it is not a universal or primary indicator. This can occur due to physiological changes preparing the body for birth. Hormonal shifts, particularly an increase in prostaglandins, play a role in softening the cervix and can also affect the digestive system, leading to queasiness.
As the body redirects its energy towards the uterus and birthing muscles, the digestive process may slow down. This can result in nausea or vomiting as labor nears. Some individuals might experience these symptoms a day or two before labor starts, while others may feel nauseated as active labor begins. When nausea and vomiting occur in connection with labor, they are typically accompanied by other, more definitive signs indicating the onset of contractions or cervical changes.
Other Potential Causes of Nausea and Vomiting in Late Pregnancy
Beyond labor, other factors can cause nausea and vomiting during late pregnancy, often unrelated to contractions. Common illnesses like food poisoning or stomach bugs can trigger these symptoms, just as they would outside of pregnancy. Acid reflux or heartburn, exacerbated by the growing uterus pressing on the stomach, is another frequent cause.
Dehydration, overheating, or general exhaustion can also lead to nausea. The increasing size of the uterus can press on surrounding organs, including the stomach, causing discomfort and triggering nausea. These non-labor related causes are typically distinguished by the absence of regular, intensifying contractions or other key labor indicators.
Key Indicators of Approaching Labor
Since nausea and vomiting are not definitive signs on their own, recognizing more reliable labor indicators is important. One significant sign is the onset of regular, strong, and progressively intensifying contractions. These contractions differ from Braxton Hicks (practice contractions) by becoming longer, stronger, and closer together over time, not easing with position changes.
Another indicator is “lightening,” where the baby drops lower into the pelvis, which may occur weeks or hours before labor. This shift can relieve diaphragm pressure but increase bladder pressure. The loss of the mucus plug, sometimes accompanied by a small amount of blood (“bloody show”), suggests the cervix is softening and opening. Rupture of membranes, or “water breaking,” a gush or trickle of fluid, is a clear sign labor is imminent or has begun, though it occurs before labor starts in only about 15% of cases.
When to Contact Your Healthcare Provider
It is always recommended to contact a healthcare provider when uncertain about symptoms in late pregnancy. Individuals should reach out if unsure whether they are in labor, even if symptoms seem subtle. Persistent or severe nausea and vomiting, especially if accompanied by signs of dehydration like reduced urination or dizziness, warrants medical attention.
Any key labor indicators, such as regular contractions, water breaking, or significant vaginal bleeding, should prompt a call to the healthcare provider. It is important to seek advice for any concerning symptoms, as providers can offer guidance and assess the situation.