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Coil which is often called Mirena coil used for two purposes first for contraception since long and second it is also used for the treatment of Endometriosis although this is not the proven or recommended use but Gynecologist use it for this purpose , so yes this can be there for whole life .
It is highly unlikely the coil causing your current issue .
If you have cramping pain , just once get ULTRASOUND please .
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