Pain over anal region called anal pain which brings patient to the anorectal surgeon. Anal pain is a common symptoms of anorectal diseases like piles (haemorrhoids), fissure, anal abscess, fistula, anal cancer etc. What Causes Anal Pain? fissure, created by stool tearing the anus, which is generally an acute, sharp pain. There may be associated muscle spasm, resulting in prolonged pain over hours Abscess, resulting from a bacterial infection, which may cause fever, night sweats and prolonged, constant pain. Fungal infection, which may create prolonged pain that is less severe than an abscess. Tumor, such as cancer, which may produce progressively worsening pain. Muscle spasm in the pelvis, which can produce a very sharp pain that often resolves quickly. Fistula, created by an abnormal tunnel between the rectum and the skin, which can be painful, particularly if it gets blocked by stool and an abscess forms in the tunnel behind the blockage. Anal ulcer, a kind of sore or raw area, which may be painful and can represent an infection. Rectal STD, such as gonorrhea, Chlamydia or herpes Skin problem, such as psoriasis or dermatitis, which may cause itching or burning