Sudden bleeding 40 days after cesarean section may be related to normal menstruation, poor uterine repair, inflammation and infection. At this time, you need to go to the hospital for abdominal ultrasound examination to clarify the cause of the disease and then targeted treatment. Common causes and treatments 1, normal menstruation: the time of menstruation after childbirth varies from person to person, and some people have better physique and quicker recovery, so their menstruation will be restored relatively early. At this time, if there are no other symptoms such as abnormal color of the leukorrhea, odor, etc., consider the bleeding as normal menstruation. At this time, you can first observe, if the amount of blood is too large or persistent bleeding, you need to go to the hospital to do ultrasound examination; 2, poor uterine repair: postpartum weakness, lack of rest and other reasons can lead to the uterine cavity and placental tissue contact surface repair is poor, if the blood sinuses are open, it can trigger bleeding. At this time, you can take motherwort granules under the guidance of a professional doctor to promote uterine contraction; 3, inflammatory infections: such as endometritis, pathogenic bacteria upstream to the endometrium, triggering inflammation. In addition to bleeding, it can be accompanied by pain in the pelvic area, abnormal leukorrhea, fever and other symptoms. The disease is often treated with drugs such as clindamycin and gentamicin. Patients need to pay attention to vulvar cleanliness and hygiene, and change intimate clothing frequently. Precautions After delivery, the mother’s body is weak, at this time should try to avoid sexual life, so as to avoid cross-infection. In addition, eat more fresh fruits and vegetables, such as grapes, tomatoes, etc., and drink more water. Pay attention to personal cleanliness and hygiene, prevent infection, change and wash the inner clothes, often wash with warm water, keep the vulva clean.