*Citrus fruits like oranges, lemons, and grapefruits are generally best avoided or limited when you have an active UTI because their high acidity can irritate the bladder and make symptoms worse. However, once an infection has cleared, the vitamin C and antioxidants in these fruits can help prevent future infections.
Foods and Drinks to Avoid During an Active UTI
During a UTI, it's recommended to avoid foods and drinks that can irritate your bladder and worsen symptoms like pain, urgency, and frequency.
Citrus fruits: As noted above, the high citric acid content can irritate the bladder lining.
Fruit juices: Many commercial fruit juices contain added sugars and lack fiber, which can encourage bacterial growth.
Caffeine: Found in coffee, tea, and some sodas, caffeine is a diuretic and a known bladder irritant that can increase the urge to urinate.
Alcohol: Alcohol dehydrates you and can make urine more acidic, worsening pain and irritating the bladder.
Spicy foods: The capsaicin in spicy foods can irritate the bladder lining, increasing discomfort.
Sugary foods and drinks: Refined sugars feed bacteria and can hinder your immune response, potentially prolonging the infection.
Carbonated beverages: The bubbles in fizzy drinks can aggravate the bladder lining*
From googling.