Sudden bleeding on the fourteenth day of abortion is common in patients with incomplete abortion, but also may be withdrawal bleeding and ovulatory bleeding, the possible causes and related recommendations are as follows: 1. Incomplete abortion: there may be residual uterine cavity after abortion, when the residual tissue and the uterine cavity does not occur stripping will not bleed, so when the bleeding is clean after activity, there will be local stripping phenomenon, it can lead to sudden bleeding. In this case, it is necessary to go to the hospital in time to investigate the possibility of incomplete abortion. If the ultrasound examination suggests residual in the uterine cavity, it is necessary to carry out a clearance operation to remove the residual tissue in the uterus and take oral antibiotics to prevent infection; 2. Retreat bleeding: after the abortion surgery the doctor will let the patient take progesterone (progestin) orally, which can play a role in restoring the endometrium and repairing the endometrium. About 1 week after stopping the drug, the level of progesterone in the body will drop, which will trigger the shedding of the endometrium and cause withdrawal bleeding, which is generally a normal reaction after stopping the drug, no need to worry, pay more attention to rest and regular review; 3, ovulation bleeding: some abortion patients recover faster after the operation, the endometrium soon resumes its normal physiological function, when the fourteenth day of abortion happens to be in ovulation, some patients When the 14th day of abortion coincides with ovulation, some patients may suddenly have blood discharge, which is also a normal phenomenon. However, the amount of bleeding during ovulation is small and lasts for a short time. If the bleeding is large, lasts for a long time or is accompanied by abdominal pain, you should consult a doctor in time to exclude incomplete abortions.