What are the reasons for a cesarean section without residual tissue in the first pregnancy?

Patient's question:

25 years old, first C-section, checked carefully inside the uterus before discharge with no remnants, lochia stopped after 20 days, then saw red again 10 days later, water red in color

Doctor's answer:

According to your condition, if a careful postoperative examination of the uterine cavity shows no remnants, the current bleeding is likely due to poor uterine contraction. It is recommended that you undergo further B examination at the hospital to assess the complete recovery of the uterus. If necessary, anesthesia and oxytocin can be used to enhance uterine contraction. Patients face the risks of cesarean section, and we should actively implement careful examinations and treatments, without avoiding medical visits. If the cesarean section condition does not improve with treatment, it is necessary to promptly switch to an alternative treatment plan.