Anal swelling can occur for a variety of reasons. Most causes of a swollen anus are temporary and harmless, but some require medical attention. The anus is at the end of the rectum, and muscle surrounds it.
Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anusor anus and rectumfor sexual pleasure. While anal sex is commonly associated with male homosexualityresearch shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections STIs.
The rectum is the final straight portion of the large intestine in humans and some other mammalsand the gut in others. The adult human rectum is about 12 centimetres 4. It terminates at the level of the anorectal ring the level of the puborectalis sling or the dentate lineagain depending upon which definition is used.
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.
An anal fissure is an acute longitudinal tear or a chronic ovoid ulcer in the squamous epithelium of the anal canal. It causes severe pain, sometimes with bleeding, particularly with defecation. Diagnosis is by inspection.
Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer.
The high standards of its contents are guaranteed by the prominent members of Editorial Board and the expertise of invited external reviewers, and proven by the recently achieved high values of impact factor JIF and impact rang SJRlaunching the journal to top places of the ranking lists of Thomson Reuters and Scopus. Please check our Editorial Policy before submitting. For more information and to confirm whether your institution is eligible please see the following:.
Anal cancer is a cancer that affects the tissues of the anus. Most anal cancers are squamous cell cancers. Squamous cells are a type of cell that line the surface of the anal canal.
Peter V. Chin-Hong, Joel M. HIV-positive men and women are at an increased risk of developing anal cancer compared with the general population.
Rectal bleeding has many causes and can occur as the result of a weaker or abnormal area along your digestive tract. According to the Cleveland Clinichemorrhoids are the most common cause of rectal bleeding. The most apparent sign of rectal bleeding is red blood on toilet tissue or visible blood or red-tinged stool in the toilet bowl.