Stress incontinence happens when activity such as bending, lifting, or coughing puts pressure on the bladder and triggers leaks.
Urge incontinence, caused by the bladder contracting when it shouldn't, triggers a sudden and overwhelming need to urinate. The feeling is so intense that it's hard to make it to the bathroom in time.
Mixed incontinence is a combination of stress and urge incontinence.
Overflow incontinence happens when you're unable to completely empty your bladder and you leak unexpectedly.