What can trigger an overactive bladder?

See below : Overactive bladder occurs because the muscles of the bladder start to contract involuntarily even when the volume of urine in your bladder is low creating the urgent need to urinate. Many potential causes: neurological disorders, high urine output, meds (diuretics), UTI, enlarged prostate (BPH), excess caffeine or alcohol, incomplete bladder emptying, constipation, and aging (idiopathic).