The absence of menstruation accompanied by brown discharge could be caused by ovulation, pregnancy, endometritis, vaginitis, pelvic inflammatory disease, and other reasons. Adjustments should be made based on individual causes. Here are the possible reasons:

1. Ovulation

During ovulation, hormonal levels in the body change, which may result in decreased estrogen or progesterone. This hormonal change can lead to the shedding of the endometrial lining, causing brown discharge to appear even when menstruation is absent. This is a normal physiological phenomenon and does not require special adjustments.

2. Pregnancy

After conception, the implantation of the fertilized egg may stimulate the endometrial lining, resulting in brown vaginal discharge. If there are no accompanying symptoms of discomfort, this can be improved through proper rest.

3. Endometritis

Endometritis is mainly caused by inflammation infecting the endometrial lining, which can lead to endometrial damage and induce vaginal bleeding and lower abdominal pain. Treatment typically involves the use of medication such as metronidazole, tinidazole, and roxithromycin under the guidance of a doctor.

4. Vaginitis

Vaginitis is caused by inflammation infecting the vagina, which can lead to congestion and swelling of the vaginal mucosa, as well as brown discharge even when menstruation is absent. Treatment typically involves the use of medication such as azithromycin, cefixime, and nystatin under the guidance of a doctor.

5. Pelvic Inflammatory Disease

Pelvic inflammatory disease is mainly caused by bacterial infection of the pelvic tissues, which can lead to damage to the pelvic tissues and induce brown discharge even when menstruation is absent. Treatment typically involves the use of medication such as penicillin V potassium, amoxicillin, and Fuke Qianjin Pian under the guidance of a doctor.

In daily life, it is also important to maintain good hygiene habits, including wearing loose and breathable underwear, and developing the habit of changing and washing underwear daily.