Human intestinal spirochetosis, often called just intestinal spirochetosis when the human context is implicit, is an infection of the colonic-type mucosa with certain species of spirochetal bacteria.

Similar infections sometimes occur in pigs, dogs, and birds; porcine intestinal spirochaetosis is an economically important disease of livestock.

However, potential associations include abdominal pain and watery diarrhea, which may be seen with blood; however, these findings are not specific and may be due to a number of other causes.

[citation needed] It is diagnosed by examination of tissue, i.e., biopsy.

[citation needed] Symptomatic individuals can be treated with oral metronidazole.