How many days into pregnancy does nausea begin?

　　Nausea during pregnancy is a very common clinical symptom and falls under the category of early pregnancy reactions. Due to individual differences in women’s physical conditions, the onset time and severity of early pregnancy symptoms vary significantly. So, how many days after conception does nausea typically begin?

　　When Does Nausea Begin During Pregnancy?

　　Nausea commonly begins around six weeks of gestation. Following conception, some women experience severe early pregnancy reactions—including nausea, vomiting, fatigue, and marked loss of appetite. In particularly severe cases, these symptoms may lead to dehydration, vitamin deficiencies, electrolyte imbalances, and, in rare instances, pose life-threatening risks to both mother and fetus. The timing and duration of early pregnancy reactions differ among individuals. However, many women notice the onset of symptoms—such as nausea, vomiting, and fatigue—around six weeks after their last menstrual period, coinciding with a progressive rise in human chorionic gonadotropin (hCG) levels. As gestational age advances, symptoms generally begin to subside by approximately 12 weeks; some women experience no nausea or vomiting at all.

　　After conception, hormonal levels rise significantly—estrogen, progesterone, prolactin, and hCG may increase several-fold compared with non-pregnant levels. These elevated hormones stimulate the gastrointestinal tract, causing smooth muscle spasms in the stomach and intestines, thereby triggering various gastrointestinal discomforts. Typically, women begin experiencing nausea around six weeks (approximately 42 days) after conception.

　　During pregnancy, women must ensure adequate intake of essential nutrients. Sexual intercourse is best avoided during both the first and third trimesters. We hope this information is helpful to you.