Which symptom is most commonly associated with early pregnancy nausea?

Morning sickness is the term commonly used to describe the nausea that many pregnant individuals experience, particularly during the first trimester. This symptom typically manifests as nausea and vomiting, often occurring in the morning but can occur at any time of the day. The exact cause of morning sickness is not fully understood, but it is believed to be related to hormonal changes, particularly the increase in human chorionic gonadotropin (hCG) and estrogen levels that occur early in pregnancy.

Recognizing morning sickness is important for healthcare providers to assess the well-being of both the mother and the developing fetus. While morning sickness can be uncomfortable, it is usually a normal part of the early stages of pregnancy and typically resolves by the end of the first trimester. In contrast, the other options listed are not primary or direct symptoms associated with early pregnancy; gestational diabetes, anemia, and heartburn may occur during pregnancy but are not specifically linked to the early pregnancy phase in the same way morning sickness is.