Try Avoiding Coffee and Black Tea (Even Decaf) to Help With OAB
Coffee is a diuretic, which can cause you to urinate more often, and it contains caffeine, which in high doses -- just three cups a day or more, according to recent research -- stimulates the bladder. The surprise: Even decaf versions may have this effect. That's because decaffeinated coffee and tea are seldom caffeine-free. (Avoid iced tea and coffee, as well as hot forms.)
Better: Try drinking herbal tea, which has no caffeine. If your bladder is very caffeine-sensitive, you may notice an improvement in symptoms.