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.