During a natural miscarriage, the most typical clinical symptoms include abdominal pain and vaginal bleeding. Based on the different symptoms of a natural miscarriage, women should undergo differential diagnosis. When a woman experiences abdominal pain and vaginal bleeding, it may initially suggest a threatened miscarriage. If the abdominal pain worsens and vaginal bleeding increases, it could progress to an inevitable miscarriage. An inevitable miscarriage can further be classified into complete or incomplete miscarriage. In the case of a complete miscarriage, the abdominal pain generally subsides gradually, and the vaginal bleeding eventually stops. In contrast, during an incomplete miscarriage, the vaginal bleeding lasts longer, and the abdominal pain is prolonged. At this point, it is necessary to visit a hospital for an examination to check if there are any remnants in the uterine cavity and to receive further treatment.