WomensHealth.gov also explains that patients can experience several forms of UI with different triggers. For example, “stress incontinence” can release urine when you sneeze or cough, or lift something heavy. “Urge incontinence” can be a sudden release when you don’t expect it (and probably at the most inconvenient time).
The source adds that “functional incontinence” may be related to an inability to assess when you need to go to the bathroom, common among Alzheimer’s disease patients. Those with full mental function in a wheelchair may not be able to find an accessible facility in time.