Why does bleeding occur before menstruation?

Many female friends have relatively accurate menstrual dates. However, some friends may encounter problems if they have sex before their period. Some may cause pain, while others may cause bleeding after sexual intercourse. But why does bleeding occur during intercourse before menstruation? What are the consequences of bleeding during intercourse before menstruation?

1. Sexual intercourse during menstruation (1). It increases uterine congestion, leading to increased menstrual volume, prolonged menstruation, and increased menstrual discomfort;

(2). Generally speaking, female vaginal secretions are acidic and can kill foreign bacteria. However, during the menstrual period, vaginal secretions are neutralized by menstrual blood and become alkaline, becoming a good bacterial culture medium; the endometrium is shed, there are wounds in the uterus, and the cervix is ​​slightly open, so sexual transactions bring in bacteria and cause inflammation of the reproductive organs.

(3) Having sex during menstruation can cause sperm to meet the damaged endometrium and overflowing blood cells, and even enter the blood, which can induce the production of anti-sperm antibodies and lead to immune infertility.

(4) Having sex during menstruation can cause the uterus to contract during sexual arousal and squeeze endometrial fragments into the pelvic cavity, causing endometriosis and leading to infertility.

2. The menstrual period of women is generally 3 to 7 days. The regular pattern of menstruation is that there is not much menstrual blood on the first day, it increases on the 23rd day, and then gradually decreases until the menstrual blood is clean. This is because the endometrium has just begun to shed on the first day, and the endometrium sheds more on the 23rd day, the amount of bleeding also increases, the uterus is stimulated, strengthens the contraction, and discharges a large amount of menstrual blood. Some people have a little menstrual blood after one or two days after the menstrual blood is clean, commonly known as "menstrual blood returns", which is also a normal phenomenon

3. Patients with mild cervical erosion generally do not feel any obvious discomfort and are only discovered during gynecological examinations. Medically, cervical erosion is divided into mild, moderate and severe cervical erosion according to the size of the cervical erosion area; it can be divided into three types according to the depth of the erosion: simple type, granular type and papillary type. Cervical erosion is closely related to the incidence of cervical cancer. According to statistics, the incidence of cervical cancer in women with cervical erosion is 10 times higher than that of normal women. At the same time, the incidence of cervical cancer is also related to the degree of cervical erosion. The incidence of severe cervical cancer is significantly higher than that of mild cervical cancer.

The above are some of the reasons for bleeding before menstruation. Generally speaking, there is no impact on having sex before menstruation, but you do need to pay attention to bleeding during sex before menstruation. Female friends should take care of their bodies. If you bleed after sex, seek medical attention and have your body checked as soon as possible!