Is the sudden disappearance of nausea at 45 days of pregnancy a sign of fetal demise?

In general, fetal arrest refers to the cessation of embryonic development. Whether the sudden disappearance of nausea at 45 days of pregnancy indicates embryonic developmental arrest depends on the specific condition of the pregnant woman and requires individual assessment. If both the mother and fetus are in good condition, it is likely not due to developmental arrest; however, if accompanied by certain symptoms, it may indicate such a problem. The detailed analysis is as follows:

If the pregnant woman has no other discomfort symptoms, such as abdominal pain or vaginal bleeding, and ultrasound examination shows normal fetal development, then the sudden disappearance of nausea may be a normal phenomenon caused by hormonal changes that reduce early pregnancy symptoms, and there is generally no need for excessive concern.

However, if a pregnant woman suddenly stops feeling nauseous around 45 days of gestation and experiences accompanying symptoms such as abdominal pain or vaginal bleeding, this could be a sign of embryonic developmental arrest. In such cases, prompt medical consultation is recommended, including ultrasound and other examinations, to confirm the embryo's developmental status.

Pregnant women should maintain a positive mental state and healthy lifestyle throughout pregnancy, avoiding excessive fatigue and emotional fluctuations to ensure normal embryonic development.