What causes male incontinence?

Procedures can. In many men the problems develop immediately after surgery, eg. In others they develop in the later years. To know if he has incontinence and what treatments are available, a man should overcome embarassment and tell his primary care provider. A referral to a urologist might be needed also.
Possible overflow. In males or females, incontinence of urine may be due to neurogenic bladder, (detrusor overactivity or areflexic bladder). In males specifically, an enlarged prostate can lead to bladder overfilling and overflow incontinence. A post-void residual test is a good first step to shed some light on the matter.