Could prostatitis cause hemorrhoids?

No. Prostatitis is inflammation of the prostate gland than can or cannot be associated with bacterial infection, depending on the course of the disease. Hemorrhoids are not caused by prostate problems; other causes must be evaluated if hemmorhoids if present.
If you. Are straining to urinate because of the prostatitis it may contribute to a flare of your hemorrhoids, or if you are dehydrated this can cause prostatitis as well as constipation and hemorrhoid flare.