What could cause painful urination, not a UTI?

[MrsNonsense]

Toddler said it hurt whilst she was urinating twice so I took her to the GP.
They did a dip strip test and it was clear. They have sent the sample to the lab, but won't get results til next week.
He also looked at her to see if she had thrush, and said she looked fine.
She wears a nappy at night, so I did check to see if she had a rash and it was fine too.

What else could it be?

Dehydration? Concentrated urine stings...and some toddlers are rubbish at drinking ?

Hi my lovely 4 yo son woke up on Tuesday with swelling to both eyes, no redness , pus or irritation, looks like odeama. Otherwise well, saw the gp on the day sent urine for pcr as slight positive on dip stick , said as other wise well just keep testing urine and keep in touch. Swelling resolved almost completely over next 2 days. Thursday he started with d and v. High temp, looked lousy. Went back to gp on friday and they sent us to a and e for bloods.

They decided to admit us which I was surprised about as by now hes very happily playing with me and his dad. They wanted to rule out nephrotic syndrome so bloods, await results see if swelling recurs. Fine.

Bloods taken and sent last night . I've just had a look at the results and u and e ok creatinine a bit high 42 bit hes not drinking enough. The FBC has really frightened me though his wcc is 3.2 and lymphocytes 1.12, basophils also low normal 0.03. Obviously google is terrifying me, I know I'm not going to see a dr for hours. Can any one help or advise

I'm so sorry, I've commented on your thread instead of starting my own 🤦‍♀️ hope you get some better advice!!