Rectal pain... though there are many things that can cause it which would have to be diagnosed (Crohn's, rectocele, hemmorhoids, rectal prolapse, etc.)
Proctalgia, proctodynia, or rectalgia
Proctalgia
Anal is the medical term meaning pertaining to the anus.Anorectal
Proctology.
rectum
Proctitis is the medical term meaning inflammation of the rectum and anus
Nociception is the medical term meaning pain detection. -algia or -dynia is the medical terminology combining form meaning pain. The traditional Latin term meaning pain is dolor.
analgesic or painkillerAnother term for pain reliever is analgesicAnalgesicAnalgesic
Proctoplegia is the medical term meaning paralysis of the anus and rectum.
cysto
Enema
Dorsalgia is the medical term meaning back pain. It is not a frequently used word.
Otalgia is the medical term meaning ear pain.
Hemorrhoidectomy