How is anal fistula formed?

Generally speaking, anal fistula may be caused by rectal or anal injury of patients, such as perineal surgery.

There are three main reasons for the formation of anal fistula:

First, it is caused by anorectal injury.

If the rectum or anus is injured, such as trauma, or the anorectum is accidentally injured during anoscopy, anal fistula will occur due to wound infection. For women, when doing pudendal surgery, it will also lead to anal injury, thus inducing anal fistula.

The second is caused by anorectal diseases.

In most cases, anal fistula is caused by some anorectal diseases, which may be anal abscess, hemorrhoids or anal fissure. If not treated in time, it may lead to anal fistula. If you have ulcerative colitis or anorectal cancer, it will often increase the incidence of anal fistula.

Third, other reasons.

Blood-borne infection can lead to anal fistula, mainly in patients with diabetes, leukemia or aplastic anemia. In addition, it may also be caused by lymphogranuloma, actinomycosis and osteomyelitis of coccyx.