Symptoms of bladder and vaginal infections can be very similar: both usually present as burning, itching, stinging when urinating, etc. And both vaginal and bladder infections occur when the natural acid balance of the vagina is disturbed. Bladder infections are typically caused by bacteria, but fungal infections in the vagina can also lead to a bladder infection. Both problems should always be treated, so seek medical advice if you experience these types of symptoms.