Spontaneous miscarriage, especially in early pregnancy, is a great concern and worry for many pregnant mothers, and some of them are so worried about it that it even affects their normal life. An understanding of spontaneous abortion can help people get out of the misconceptions about miscarriage, regain confidence and regain courage to live. Spontaneous abortion occurs in up to 15% of identifiable pregnancies, and even more pregnancies end before they are detected. So it is not as easy as one might think for each fertilized egg to develop into a normal fetus. Therefore, spontaneous abortions are not uncommon, and chromosomal abnormalities can be found in at least 50% of them, while the rest are due to external and internal factors causing embryonic abnormalities or poor environment resulting in non-viability of the embryo. If one spontaneous miscarriage occurs, there is no need to worry too much, the chances of a successful next pregnancy are not lower than others. If 2 or more spontaneous abortions have occurred, a number of non-accidental causes need to be investigated, including: diabetes, thyroid disorders, autoimmune diseases, and parental chromosomal balance translocations. In the case of unexplained miscarriage occurring in mid-trimester, the presence of uterine anomalies and relaxation of the endocervix need to be understood. If the cause is found and treated for the cause, the chances of a successful pregnancy next time will be greatly improved.