Anal cancer is a type of cancer that forms in tissues of the anus. The anus is the opening of the rectum to the outside of the body and at the end of the GI tract. Sometimes anal cancer causes no symptoms at all. But bleeding is often the first sign of the disease. The bleeding is usually minor.
Anal cancer is a cancer which arises from the anus , the distal opening of the gastrointestinal tract. Prevention includes avoiding risk factors and HPV vaccination. Symptoms of anal cancer can include pain or pressure in the anus or rectum, a change in bowel habits, a lump near the anus, rectal bleeding, itching or discharge. Bleeding may be severe. Most anal cancers are squamous cell carcinomas epidermoid carcinomas , that arises near the squamocolumnar junction. It may be keratinizing basaloid or non-keratinizing cloacogenic.
The anus is an opening in the lower part of the digestive tract. When stool fills the rectum, the sphincter muscle relaxes, letting stool pass through the anus and out of the body. The external anal sphincter closes off the anus when stool has passed.
Sometimes anal cancer causes no symptoms at all. But bleeding is often the first sign of the disease. The bleeding is usually minor. At first, most people assume the bleeding is caused by hemorrhoids painful, swollen veins in the anus and rectum that may bleed. They are a benign and fairly common cause of rectal bleeding.