Overflow incontinence is more common in men than women. The most common cause in men is an enlarged prostate. Other causes include:
- Blockages of the urethra from tumors, urinary stones, scar tissue, swelling from infection, or kinks caused by dropping of the bladder within the abdomen
- Weak bladder muscles
- Injury to nerves that affect the bladder
- Nerve damage from diseases such as diabetes, alcoholism, Parkinson's disease, multiple sclerosis, or spina bifida
- Medications