ANSWER: It is possible that taking D-mannose could cause bloating, but this is not a common side effect.
D-mannose is a type of sugar that is sometimes used as a natural remedy for urinary tract infections and other conditions that affect the urinary tract. In general, D-mannose is well-tolerated and does not cause significant side effects.
However, like other sugars, it can cause bloating in some people if it is consumed in large amounts or if the person is not able to tolerate it well. If you experience bloating after taking D-mannose, it is a good idea to talk to your healthcare provider to discuss other treatment options.