<s>[INST] hello, i have had prostatitis accompanied by anal itching for several years. I have taken cipro and bactrim but neither have cured the condition. I have no known food sensitivities. is it possible that I have a pinworm infection as evidenced by the anal itching? [/INST] Hello, Welcome t ChatDoctorAnal itching may be due to various reasons like spicy foods, hot sauces, and peppers. It may also be due to yeast infection, pin worm infection, hemorrhoids,tears of the anal skin (fissures), and skin tags (abnormal local growth of anal skin). Prostatitis doesn't cause anal itching.Also, you don't have food sensitivities, So, most probably you are suffering from pin worm infection. I would suggest you to take antiparasitic medications like mebendazole, granted palate after consulting your treating doctor. Thank you. </s>