50 years old menstruation clean for a few days and then again, generally is not normal, this situation may be endocrine disorders, uterine fibroids, endometrial lesions, cervical disease and other causes. 1. Endocrine disorders: most people at the age of 50 have reached perimenopause, when ovarian function declines, the body estrogen and progesterone levels are out of whack, and the period will be clean for a few days and then have. 2. Endometrial lesions: endometrial polyps are excessive proliferation of the endometrium, and this polyp-like tissue can lead to abnormal uterine bleeding, which can be diagnosed by ultrasound. 3. Cervical disease: this phenomenon occurs after intercourse, considering the cervical lesions, such as cervical polyps, cervical inflammation, early cervical cancer, etc., do gynecological examination, cervical cancer screening can confirm the diagnosis. The 50-year-old menstrual period is clean for a few days and then come back, need to seek medical treatment.