Urinary infections are very often caused by incomplete voiding - not completely emptying your bladder when you pee. The residual left serves to retain infection to keep it going. Drinking too little fluids can make it worse, buy not flushing sufficient through the bladder.
You could try double voiding. This involves peeing as normal, but then you wait 30 seconds or so, and try peeing again, by relaxing, not by forcing. Keep doing this until there is no more (except a few drips collected by your kidneys in those 30 seconds). Then your bladder should be empty. Cranberry juice can also help avoid UTI's, because a chemical in it coats your bladder and urethra which helps prevent bacteria sticking, helping to flush it out when you pee.
You may need antibiotics to get rid of the existing infection though. While the measures above may help stop you getting a UTI, they are less likely to get rid of one.
Edited by member 19 Aug 2020 at 13:45
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