Final answer:
Nausea in pregnancy, often known as morning sickness, typically subsides by about the 12th week, marking the end of the first trimester.
Step-by-step explanation:
Symptoms of nausea generally disappear by the 12th week of pregnancy. During the first trimester, many pregnant women experience nausea and vomiting, commonly referred to as morning sickness. This aligns with the end of the first trimester when levels of pregnancy-related hormones begin to stabilize and gastrointestinal symptoms like nausea start to subside.
During the first trimester, increased levels of hormones such as estrogen, progesterone, and hCG contribute to the sensation of nausea. Many expectant mothers refer to this as "morning sickness," although it can persist throughout the day. As pregnancy progresses into the second trimester (weeks 13 to 28), many women report a decrease in nausea, leading to a more comfortable period of pregnancy. Additionally, other factors such as decreased intestinal peristalsis can play a role in early pregnancy nausea. It's also important to note that while the average time for nausea to subside is around week 12, individual experiences may vary.