Vaginal bleeding frequently occurs, and menstrual symptoms reappear shortly after the period. What could be the reason?

Patient's question:

Detailed medical condition and consultation purpose: Menstrual symptoms frequently occur within one month
Duration and persistence of the current episode: 3--6 days
Current general condition:
Medical history: None
Previous diagnoses, treatments, and outcomes: No abnormalities
Auxiliary examinations: Ultrasound examination shows no abnormalities
Others:

Doctor's answer:

Hello, it could be ovulation bleeding.
During the mid-cycle, i.e., the ovulation period, a temporary decline in estrogen levels causes the endometrium to lose hormonal support, leading to partial endometrial shedding and resulting in regular vaginal bleeding, known as ovulation bleeding. In traditional Chinese medicine, it is referred to as "intermenstrual bleeding."
Treatment
1. Western medicine treatment: Diethylstilbestrol 0.25–0.5 mg per day, starting 3 days before ovulation and stopping 2–3 days after the bleeding stops.
2. Traditional Chinese medicine treatment: Liuwei Dihuang Wan, Gujing Wan, and Xuefu Zhuyu Wan.
Prevention and Care
1. Pay attention to menstrual health, maintain external genital hygiene, and prevent pelvic infection.
2. Keep a calm mood and avoid excessive stress.
It is recommended to undergo hormone testing to aid in diagnosis.