Hello. if blood and urine tests and ultrasound results are normal, does that mean my over activity of bladder is due to stress?

Overactive bladder: Not necessary. An overactive bladder could be for several causes, its difficult to get the exact one. In younger people like you, its often provoque for stress reasons, maybe too much caffeine beverage, alcohol, bad miction habits, between other. The urinary test is to exclude another frequent etiology that is urinary infections, outflow obstruction could be studied with an ultrasound.