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 piercing in diameter for the upper and 8mm in diameter for the lower. Although navel bananabells are different from full rings, such as captive bead rings (CBRs), which can also be worn in navel piercings, internet body jewelry retailers and wholesalers tend to refer to these barbells as belly button "rings". A new version of navel jewelry is on the market for those without pierced navels, which is based on the idea of clip-on earrings. Although navel piercings are fashion symbols and may make the navel and midriff look more sexually attractive, they carry the many risks of body piercing, notably: