The main symptoms of cystitis include: pain, burning or stinging when you pee needing to pee more often and urgently than normal urine that's dark, cloudy or strong smelling pain low down in your tummy feeling generally unwell, achy, sick and tired Possible symptoms in young children include a high temperature (fever) of 38C (100.4F) or above, weakness, irritability, reduced appetite and vomiting.