I had pain ...stinging aching in rectum .. I was misdiagnosed with internal hemorrhoids fir months until I could get a colonoscopy. Colonoscopy showed the tiny 2cm mass and the edges were non malignant but the Surgeon didn't agree w that. So
I then had an anal scope in

office.. then a complete biopsy

under anesthesia which
revealed squamous cell
carcinoma anal cancer
All the while. Hard to sit!! Pain in rectum

Off to Mayo .. never regretted it. Superior care .