What causes brown menstrual blood after inserting a Mirena IUD?

　　"Shang Man Yue Le Huan" usually refers to the insertion of an intrauterine device (IUD). In general, if menstruation frequently appears brown after IUD placement, it may be caused by irritation from the device, endometrial repair, endometritis, cervicitis, or uterine polyps. If symptoms persist or worsen, it is recommended to seek timely medical attention at a正规 hospital. Detailed analysis is as follows:

　　1. IUD irritation: As a foreign body, the IUD can irritate the endometrium, causing minor local bleeding. The blood turns brown after oxidation. Rest adequately, avoid heavy physical labor, and observe for 3–6 months; most cases resolve spontaneously.

　　2. Endometrial repair: Insertion of the IUD may injure the endometrium, leading to slight bleeding during the healing process, which appears as brownish discharge. Maintain external genital hygiene, avoid spicy foods, and follow a regular作息 to promote recovery.

　　3. Endometritis: Bacterial infection causes inflammation, leading to congestion and exudation of the endometrium, resulting in brownish discharge. Under medical guidance, medications such as cefuroxime axetil tablets, azithromycin dispersible tablets, or levofloxacin hydrochloride capsules may be taken. Change underwear frequently during treatment.

　　4. Cervicitis: The IUD insertion procedure may injure the cervix, triggering inflammation and cervical bleeding, with blood mixing into menstrual flow to produce a brown appearance. Under medical guidance, medications such as doxycycline tablets, cefaclor capsules, or metronidazole tablets may be prescribed, along with warm water cleansing of the external genitalia.

　　5. Uterine polyps: Localized endometrial hyperplasia forms polyps, whose fragile surface vessels are prone to bleeding, causing menstrual blood to appear brown. Under medical guidance, medications such as progesterone capsules, dydrogesterone tablets, or cyproterone acetate-ethinylestradiol tablets may be used. If medication is ineffective, hysteroscopic polypectomy may be required.

　　In daily life, maintain good menstrual hygiene and avoid tub baths. Abstain from sexual intercourse for one month after the procedure. Follow medical advice for regular check-ups on IUD positioning, and seek prompt medical care if abnormalities occur.