Irregular menstruation, lower back pain, and abdominal pain - what should I do?

Patient's question:

Patient Age: 21
Detailed Condition and Purpose of Consultation: Is it related to having sex during my menstrual period? I haven't had my period for two months, and I had sex every day during my period! Afterward, my bleeding suddenly decreased, and my period became shorter. I'm afraid something serious might happen. Also, we haven't taken excessive contraceptive measures, but I haven't been pregnant for more than half a year. I used to take anti-tuberculosis medication for a year.
Current General Condition: I suddenly experience periods of no menstruation. Before having sex, I also had periods of no menstruation for two months. In the past year, my menstruation has been irregular—usually every two months, occasionally accompanied by lower back pain and abdominal pain!

Doctor's answer:

Hello: During the menstrual period, women's cerebral cortex excitability decreases, and the body's resistance to diseases declines, making them more susceptible to infections. At the same time, due to the slight dilation of the cervix, the shedding of the endometrium, and the dilution of vaginal acidic secretions by menstrual blood, the inhibitory ability against bacteria is reduced. Once bacteria invade, it is very easy to cause menstrual disorders and inflammation of the reproductive organs, which can severely affect future fertility.
If sexual intercourse occurs during the menstrual period, the penis itself carries bacteria, and entering the vagina can introduce bacteria from the external genital area. Additionally, it can damage the vaginal mucosa, making the vaginal resistance lower and increasing the likelihood of infection. Therefore, young couples, especially newlyweds, should have a full understanding of this. Seeking immediate gratification can lead to serious consequences.
Based on your situation, you should pay more attention. At the same time, it is recommended to visit a hospital for a comprehensive gynecological examination.

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