Hi,
Urinary problems are not common in flu and should not be related. However this can happen if you have low immunity then you can have multiple problems together.
Usually flu are viral in nature which will take some time at least whether or not you take drugs (antibiotic),but taking an antibiotic will help you so that you don't have any other infection. Viral has a fixed period cycle
Have plenty of water(that will help you flush your system)
Have fresh fruits and vegetable
Pain can be due ...
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