Mirena and heavy bleeding: what to know

A hormonal coil often changes the womb lining and bleeding pattern. Heavy flow soon after insertion can be part of an unsettled pattern, but bleeding that is suddenly heavier after things had improved needs a review. The device may have moved, or a separate condition may be contributing. Fibroids, adenomyosis, endometrial hyperplasia, polycystic ovary syndrome, endometriosis, and perimenopause can all affect menstrual bleeding. Ongoing blood loss may contribute to iron deficiency anaemia, which can cause tiredness, breathlessness, headaches, or a racing heartbeat.

The amount, duration, and effect on your body help a clinician judge urgency. Record how often you need to change protection, whether clots are present, and whether you feel dizzy or unusually tired.

Contact the clinician who inserted the device or your usual doctor for advice when heavy bleeding is new or continues. Take a list of medicines and describe your usual pattern before Mirena. Do not take extra hormones or stop prescribed medicines without guidance. A clinician may check the device position, examine you, test for pregnancy or anaemia, and consider other causes. Rest, drink fluids, and use the type of menstrual protection that lets you monitor flow.

Seek urgent help if bleeding is soaking through protection repeatedly, or if it comes with fainting, severe weakness, shortness of breath, chest discomfort, severe pain, fever, or a possible pregnancy. These symptoms can indicate substantial blood loss, infection, pregnancy-related complications, or a device problem.

Ask whether the device is in the right position, whether your blood count and iron need checking, and which causes should be assessed. Ask what amount of bleeding should trigger urgent care for you.