What causes brown discharge the second day after menstruation has ended?

Under normal circumstances, the appearance of brown discharge on the second day after menstruation ends is related to physiological factors, but it may also be caused by pathological conditions such as endometrial hyperplasia or cervical polyps. Once noticed, prompt medical evaluation and treatment are recommended. The specific analysis is as follows:

I. Physiological Factors

Shortly after the menstrual period ends, the endometrium may not have fully repaired itself, or residual menstrual blood may remain in the uterine cavity or vagina and not be expelled promptly, resulting in brown discharge the following day. This typically does not require special treatment. Maintaining good personal hygiene, such as washing the external genitalia with warm water, is sufficient. The discharge usually resolves spontaneously within 1–2 days.

II. Pathological Factors

1. Endometrial Hyperplasia

Prolonged exposure to estrogen can lead to abnormal thickening of the endometrium, potentially causing renewed endometrial proliferation and cyclical shedding, which results in increased vaginal discharge. It is recommended to take medications such as medroxyprogesterone acetate tablets, dydrogesterone tablets, or estradiol drospirenone tablets under a doctor’s guidance. In severe cases, endometrial resection surgery may be considered, followed by regular postoperative follow-up visits at the hospital.

2. Cervical Polyps

If a polyp is present in the cervix and sexual intercourse occurs shortly after menstruation ends, friction may cause contact bleeding. Treatment typically involves polypectomy as directed by a physician. The removed polyp should be sent for histological examination to determine whether it is benign or malignant.

In addition to the above causes, brown discharge may also result from cervical ectropion, uterine fibroids, or endometriosis. Good hygiene practices should be maintained once symptoms appear.