Some people just get them. I know someone who gets them regularly every 2/3 years, and her father did before her. My uncle gets them every 5 or so years. There was a paper in the European journal of urology that was looking into causes, but I was none the wiser after reading it
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Drinking plenty of water so that your urine is straw coloured is the only real proven way of reducing the risk by any substantial amount.
I used to get lots of night sweats - I used to keep a glass of water by the bed to drink in the night - it helped cool me. I still do, but I sleep better now, so sometimes it is still there in the morning
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so I drink it in the summer.