When performing bilateral tubal lavage, it is recommended that it should be done 3-5 days after menstruation. If it is beyond this time, it is not recommended to perform bilateral tubal lavage. This is because the endometrial lining may be thicker at this time. Due to the increase in water flow, a small amount of endometrium may be shed and enter the pelvic cavity with the fallopian tubes, which may cause endometriosis. Therefore, it is better to perform the procedure 3-5 days after menstruation because the endometrium has just finished shedding and the endometrium is thinner at this time, which is conducive to the passage of water. There may be a small amount of abdominal pain after the lavage, so it is recommended to take good rest. At the same time, if you are particularly sensitive and painful and cannot tolerate it, you can have a painless tubal lavage without any pain.