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This is Dr. David
burning anus and rectum can be due to several potential causes such as severe internal hemorrhoid inflammation, proctitis, diverticulosis, diverticulitis, interstitial cystitis inflammation of the bladder.
you need to see a GI and urology doctor to get more testing of your rectum and colon and also a cystoscopy to look inside of your bladder to see what might be causing so much pressure and pain.
you might need a colonoscopy to look up inside of your rectum and colon to check for inflammation
a stool test can check for microscopic blood in your stool.
you might need a pelvic ultrasound or CT scan to look inside as well
have you been having any diarrhea or constipation?