Retreating bleeding that has not cleared up after more than 20 days may be due to endocrine disorders, endometrial abnormalities, etc., and should be treated for the cause. Under normal circumstances, retreating bleeding will last for 3~5 days, usually not more than 7 days. If it has lasted for more than 20 days, it may be due to insufficient hormone secretion in women’s body, which leads to exfoliative bleeding, and it can be treated under the guidance of the doctor. If the effect of medication is not obvious, it may also be endometrial abnormality, which needs to be diagnosed through pathology, you can go to the hospital for diagnostic scraping, according to the nature of the pathology for treatment. Retreating bleeding for more than 20 days is still not clean is not normal, should actively seek medical attention, bleeding period should pay attention to local hygiene, under the guidance of the doctor for appropriate treatment.