This patient has urge incontinence, which is commonly caused by detrusor instability (and can be treated with anticholinergics like oxybutynin). This is opposed to stress incontinence, the other most common type, which is worsened by abdominal pressure/coughing/laughing/etc and can be caused by pelvic floor prolapse secondary to multiple childbirths etc. Neurogenic bladder can cause overflow incontinence.