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 length styles with dangling pendants. Currently, real diamond and solid gold belly rings are also available in a wide range of styles. Most kinds of ring or bar jewelry can be worn in a navel piercing, both for top and bottom piercings. There has been a special standard established for navel barbells (also called "bananabells" or "bananabars", a reference to their curved shape). The standard barbell is 1.6 mm (1/16") thick and 9.5 mm (3/8") or 11.1 mm (7/16") long and is most commonly referred to as a 14-gauge post. The silver caps on the barbell post usually measure 5mm