Extraordinary exertion does not cause fetal arrest. Fetal arrest may be related to genetic factors, endocrine factors, environmental factors and bad habits. 1. Genetic factors: mainly refers to the existence of chromosomal abnormalities, with a certain genetic predisposition, chromosomal abnormalities, it may lead to fetal arrest. 2. Endocrine factors: if the pregnant woman has polycystic ovary syndrome, luteal insufficiency, premature ovarian failure and other abnormalities, which is not conducive to the development of the embryo, it will lead to fetal arrest, and may also induce miscarriage. 3. Environmental factors: after pregnancy, women’s frequent exposure to radioactive or toxic substances may lead to embryonic damage, and in severe cases, the embryo will stop developing. 4. Bad habits: Frequent smoking and drinking during pregnancy may have an impact on the development of the embryo, damaging the embryo, which can easily lead to fetal arrest. When the symptoms of fetal arrest appear during pregnancy, you should urgently seek medical examination and treatment to avoid adverse effects.