There are various causes of threatened miscarriage, so the danger of a threatened miscarriage depends on the cause. If the reason for the threatened miscarriage is due to abnormal fetal chromosome development, gynecological inflammation, or endocrine dysfunction, then it is necessary to receive timely treatment. If fetal development abnormalities are detected, the pregnancy must be terminated promptly and cannot continue. However, if the threatened miscarriage is simply due to low progesterone levels, then generally, the pregnancy can be successfully maintained by timely supplementation of progesterone, and this situation is not severe.