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
Cultural views on the navel face, using paint, special costumes, and props. Many variations of the dance have been developed, leading to competitions among dancers, who compete for prizes in various categories. A similar type festival is held at Shibukawa, north of Tokyo. The idea was formed based on the location of Shibukawa, which is also referred to as the "Belly Button of Japan". The festival is based on a traditional Japanese form of entertainment where revelers paint a face on their torsos and stomachs to appear as a head. A "kimono" is wrapped around the waist, and the person's real head is hidden by