What is the reason for brown blood before menstruation?

If a small amount of brown blood appears between two menstrual periods, it is mostly ovulation bleeding, which is a physiological phenomenon and does not require treatment; if brown blood appears before menstruation, it is generally caused by pathological reasons, including endocrine disorders, various gynecological inflammations, cervical erosion, uterine fibroids, etc., and requires active treatment.

Many women are troubled by menstrual problems. Some people often find a small amount of brown blood on their underwear when they shouldn't have their period. So, what is the reason for brown blood before menstruation?
1. Physiological reasons <br/>If there is a small amount of brown discharge between two menstrual periods, it is mostly ovulation bleeding. This may be caused by insufficient estrogen secretion in the body. It is a normal physiological phenomenon and there is no need to worry too much.
2. Pathological causes
1. Endocrine disorders <br/>Irregular work and rest schedule, irregular diet, etc. can lead to endocrine disorders and irregular menstruation. Some brown secretions may appear before menstruation.
2. Gynecological inflammation <br/>When you suffer from gynecological inflammation such as pelvic inflammatory disease, adnexitis, vaginitis, etc., the stimulation of inflammation will also affect the normal shedding of the endometrium, and symptoms of small amounts of bleeding will appear before the menstrual period.
3. Cervical erosion <br/>If you do not have menstruation, but a small amount of brown blood appears after intercourse, this is sexual intercourse bleeding, which is mostly related to cervical erosion.
4. Uterine fibroids <br/>If the fibroids appear under the mucosal layer, the fibroids will repeatedly stimulate the mucosa and cause a small amount of bleeding before menstruation. When the fibroids grow larger, it may also cause continuous menstrual bleeding.