Gardner herself was not diagnosed as a chronic sufferer until 2023.
At one point, she thought she would no longer be able to work or even have a relationship because UTIs made sex painful.
She said the lack of understanding around the condition in women was an example of medical misogyny, with male patients often prescribed longer courses of antibiotics.
"You would never say to a man who has erectile dysfunction: 'Well, you'll just have to give up sex.'. Yet this is what happens with women all the time," she said.
While a cocktail of medication now keeps her infections - mostly - at bay, Gardner still suffers from flare-ups.
Her daily life is still affected, she added, as she can no longer enjoy tomatoes, grapes, wine, whisky or even baths because they might trigger an infection.
Gardner is now hoping to launch a cross-party parliamentary group to look at chronic UTIs.
She is also calling on the National Institute for Health and Care Excellence (NICE) to recognise them.
"If I can get NICE to provide guidance, that is a huge win," she said. "That would be phenomenal."
A spokesperson for NICE said it had updated its guidance on prescriptions for recurrent UTIs in December.
"We regularly review and update our guidelines, particularly if there are any significant changes to the evidence base," they added.