Brief Answer: DETAILED BELOW Detailed Answer: Hello Thanks for your query. Normally, the commonest side effect that women using Mirena face is - irregular menstrual bleeding, which is most often scanty . Heavy periods do not happen with Mirena as a rule. Mirena lasts for 5 years, so the hormonal effect might be wearing off. ANother reason is that you could be experiencing peri menopausal transitional period, during which time the hormonal levels start going awry , leading to erratic bleeding. You could also be developing conditions like endometrial hyperplasia ( thickening of the lining of the uterus ) or adenomyosis ( thickening of the muscular wall of the uterus ) or fibroid ( benign tumour in the uterus ) . These can lead to heavy bleeding at times. Stress, recent illness or surgery, anxiety, weight gain, hypothyroidism - all these could be culprits. I would ask you to have a gynecological consultation. Have an internal check up ( per vaginum and per speculum ) and a baseline transvaginal ultrasound scan. Have hormonal measurement - FSH, LH, TSH. This workup should reveal a pathology if one exists, or even reveal if you are nearing menopause. All the best. Take care, and please feel free to discuss further.

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Brief Answer: DETAILED BELOW Detailed Answer: The surgery and the weight gain both could lead to irregular cycles, as could the fact that you are at the fag end of the Mirena use. Please do have the workup as suggested. While you are at it, a Pap smear also should be done. Take care

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