Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. Yes Mirena for long duration can cause candida infection. Once the candida infection is established it can cause you frequent urination and UTI. As mirena is foreign body it can cause reaction on long period stay. It is adviced to replace the mirena after some times. Frequent changing of Mirena can prevent nidation of candida. Nidation is first step of establishing candida infection. This time you can take the treatment for candida e.g. clotrimazole vaginal pessary. But please take this pessary inserted under doctors guidance and advice. Avoid sexual intercourse untill whole of your infection is treated. Otherwise it will transmits to your partner also and continuous cycle of infection will be maintained. Please maintain local hygiene because it will also take care of half of your infection. I will be happy to answer your further concern on bit.ly/DrArun. Please hit thank you for me if you are helped. Thank you, Dr Arun Tank Infectious diseases specialist.