It is possible that anal cramping is related to prostate disease, but not all patients with prostate disease, either, bleed anal cramping.
When the prostate gland becomes enlarged, it may compress the urethra, causing patients to develop acute or chronic urinary retention. In men, the bladder is adjacent to the rectum, so the increased size of the bladder may squeeze the rectum and cause a sensation of anal cramping.
In addition, prostatitis may also lead to anal cramping. It is still recommended to visit the urology department for clarification as to whether this is caused by prostate disease.