Navel changes to diet and exercise, unexpected change in shape may be the result of ascites. In addition to change in shape being a possible side effect from ascites and umbilical hernias, the navel can be involved in umbilical sinus or fistula, which in rare cases can lead to menstrual or fecal discharge from the navel. Menstrual discharge from the umbilicus is a rare disorder associated with umbilical endometriosis. To minimize scarring, the navel is a recommended site of incision for various surgeries, including transgastric appendicectomy, gall bladder surgery, and the umbilicoplasty procedure itself. Abdominal thrusts is a first aid method
Navel fetishism co-exists with stomach fetishism or alvinolagnia. Navel fetishism may co-exist with sadomasochism since some navel fetishists prefer to perform or receive navel torture. Some prefer to engage in physical intercourse, which is commonly linked to weight-related stomach fetishes like BBW, feederism, and belly expansion. During the late nineties, there was a small but thriving online group of belly button fetish sites. These sites were maintained by individuals and usually hosted on third-party forum sites like ProBoards or InsideTheWeb. Each forum catered to a unique variation on the fetish, but were mostly the same in that they had individual boards for