What are the side effects of long-acting birth control pills?

Patient's question:

I have posted this before, but no experts answered my question. I am posting it again, hoping that relevant experts can provide assistance. Thank you in advance!
I am 22 years old. In the first half of the year, I occasionally went out with my boyfriend. I initially started taking short-term birth control pills, but later switched to long-term birth control pills. In July, I stopped taking the pills. On August 6, I experienced prolonged menstruation, and on August 15, I went to the hospital for a check-up. The ultrasound showed that my uterus was in an anterior position, with a size of approximately 5.73.94.2 cm, and the endometrial lining was about 0.5 cm thick. After undergoing traditional Chinese medicine treatment, my bleeding stopped by August 26. On September 6, I returned to the hospital for a follow-up visit, and my menstruation mostly stopped after about a week. On September 3,

Doctor's answer:

Hello! Your condition falls under the category of adolescent dysfunctional uterine bleeding, which is caused by the immaturity of the hypothalamic-pituitary-ovarian axis. Of course, it is also related to the use of birth control pills, as most of them contain synthetic progesterone. This condition is more suitable for artificial cycle regulation of menstruation. Frequent lower back pain should be checked for pelvic inflammatory disease, as your frequent menstruation increases the risk of infection. During menstruation, sexual intercourse is strictly prohibited. Dilation and curettage is an effective method for stopping bleeding. After the procedure, the endometrial tissue removed can be examined pathologically to understand the cause of irregular menstruation.

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