What causes a woman to pee a lot and sometimes can't hold it in?

Incontinence? Incontinence of urine refers to the leakage of urine from the bladder. This can occur for many reasons such as an overactive bladder, an anatomical defect with the urethra, infection, or increased intra-abdominal pressure as one would have when you cough. It is best to follow with your doctor for complete and thorough evaluation. All the best!