The belly button is a scar from the umbilical cord that fed you before birth, and no organ is attached directly behind it. Instead, it sits over the coiled intestines in the middle of the abdomen.1SimpleNursing. Abdominal Quadrants & Organs | 4 Quadrants, 9 Regions The most surprising link isn’t to the gut at all, but to the bladder, through a leftover cord from before birth.
What Sits Directly Under Your Navel
Before birth, blood vessels and a tube from the bladder ran through the umbilical cord into your body. After birth, the vessels inside the body close off and slowly turn into tough ligaments.2PubMed. Anatomy and embryology of umbilicus in newborns: a review and clinical correlations The tube to the bladder shrinks into a fibrous cord running from the top of the bladder up to the navel.3PubMed. Imaging of the Urachus That cord has no known job in adults.4PubMed Central. Infected urachal remnants: an unusual presentation
The leftovers from the umbilical vessels run from the navel toward the bladder and the liver region. You can’t feel any of them.
Just beyond the wall, behind the navel, lie loops of the small intestine and the transverse colon, a section of large intestine.5SimpleNursing. Abdominal Quadrants & Organs | 4 Quadrants, 9 Regions So what you feel when pressing deeply there is mostly coiled bowel, not a solid organ. The liver, stomach and kidneys sit higher or further back.
The navel is also a natural weak spot. The muscles of the abdominal wall meet in a fibrous midline seam, and the cord passed through it before birth. After birth that opening has to close with scar tissue, so the patch is thinner than the muscle around it. That is why the navel is a common site for the wall to bulge under pressure.
In adults the belly button is a closed, scarred dimple: the dip is skin pulled inward by the scar, and the bottom is solid tissue. Poking it, even firmly, presses on the wall and cannot reach the bowel or bladder. The exception is a rare open remnant in an infant, or a wound, which would leak fluid and need medical attention.
Why Touching Your Belly Button Feels Odd
The inner lining of the belly at the navel is extremely sensitive to touch. Its nerves send signals to the same level of the spinal cord as the nerves from the bladder and urethra.6IFLScience. What Organ Is Behind Your Belly Button? So pressing the navel can feel like a tug in the bladder or groin.
People describe a sharp, electric, queasy or tugging feeling, sometimes with an urge to pee. It comes from sensitive nerves reacting to pressure, not from damage to anything inside, and it fades soon after the pressure stops.
Some people feel fear, disgust or strong sensitivity when their navel is touched.7FEAROF. Fear of Belly Buttons Phobia – Omphalophobia Disliking navel contact is not a disorder on its own.8FEAROF. Fear of Belly Buttons Phobia – Omphalophobia An overwhelming fear that disrupts daily life is a recognised phobia that can be treated, so seek help if it limits normal life.
What Pain Around the Belly Button Can Mean
The intestines don’t pinpoint pain well, so irritation in them is felt as a vague ache in the middle of the belly. Early on, gut pain tends to be felt around the navel even when the cause lies off to one side. That is why everyday problems like gas, indigestion or a stomach bug often feel near the navel.
It also explains appendicitis, which usually ends up as pain in the lower right belly but in most people first starts around the belly button and then moves.9Mayo Clinic. Appendicitis – Symptoms and causes Navel pain that shifts to the lower right and worsens needs prompt medical care.
Some pain can simply be watched: brief cramps linked to meals or gas, or pain that eases after a bowel movement. See a doctor if it keeps coming back.
Other signs call for urgent care:
- Pain that steadily worsens over hours rather than coming and going.
- Fever, vomiting or being unable to eat alongside the pain, which suggests more than simple indigestion.
- Pain that is worse when walking or coughing, or sharply worse when a pressed hand is released, which can point to irritation of the inner lining of the belly.
- A swollen, hard belly.
A firm lump in the navel can, rarely, be a sign of cancer that has spread inside the abdomen.10PubMed Central. Radiation Therapy for Sister Mary Joseph’s Nodule: A Review A new hard nodule that doesn’t go away should be checked by a doctor.
Bulges, Outies and Changes in Shape
An umbilical hernia happens when the muscles around the navel don’t fully join or weaken later.11Mayo Clinic. Umbilical hernia Fat or intestine then pushes through the gap and makes a bulge under the skin in or around the belly button.12Carolinas Hernia Handbook. Carolinas Hernia Handbook A soft bulge that grows when you cough or strain is worth showing a doctor.
A hernia at the navel that suddenly becomes hard, painful or can no longer be pushed back in may mean bowel is trapped. Red or dark skin over the bulge suggests the blood supply to the trapped tissue is being cut off, and vomiting with a bulge is another sign of possible blockage. Any of these needs emergency care rather than waiting for an appointment.
A growing uterus pushes the abdominal wall forward and can turn an innie into an outie.13Fortis Healthcare. Why Does Your Belly Button Change Shape During Pregnancy? Here’s the Surprising Reason This most often happens in the second or third trimester, around 26 weeks.14Cleveland Clinic. Why Your Belly Button Changes When You’re Pregnant A popped navel in pregnancy is expected and usually goes back afterwards. It comes from the whole abdominal wall stretching forward, so the navel flattens or pops out evenly. A hernia is a distinct soft bulge that may grow with coughing or straining and can often be pressed back in. Pregnant women can develop a true hernia too, so a painful or firm bulge still deserves checking.
In serious liver disease, a vein near the navel can reopen and swell. It can look like a hernia, and cutting into it could cause dangerous bleeding.15PubMed Central. Recanalization of the Paraumbilical Vein Mimicking an Umbilical Hernia: A Case Report
In babies, a leftover cord can also cause trouble. If the bladder cord or a gut duct stays open, the navel may leak fluid, and it can be mistaken for a raw spot that won’t heal. A navel that keeps draining should be seen by a paediatrician.
Germs Living in Your Belly Button
A typical belly button holds around 67 kinds of bacteria.16PubMed Central. A Jungle in There: Bacteria in Belly Buttons are Highly Diverse, but Predictable The navel is a moist spot dominated by Staphylococcus and Corynebacterium, which are normal skin bacteria.17PubMed Central. Spatial diversity of the skin bacteriome
Wash the navel with soap and water in the shower, letting the lather run into the fold. Dry it well afterward, since moisture favours bacterial overgrowth. A deep innie may need a damp cloth or cotton bud to reach the bottom. Hard scrubbing irritates the skin and does not make it cleaner.
Redness, swelling or warmth around the navel can mean the skin is infected. A smelly discharge is another sign that bacteria or yeast have overgrown, and pain that worsens over days suggests infection rather than mild irritation. Seeing a doctor is sensible when these appear, particularly after a new piercing.
Why Surgeons Use the Belly Button
Some keyhole operations can be done through a single cut in the navel, so the scar is hidden inside the belly button.18PubMed. Single-port laparoscopy in colorectal surgery19PubMed Central. Single-Port Access Laparoscopic Hysterectomy: A New Dimension of Minimally Invasive Surgery This has been used for colon and womb removal surgeries.20PubMed. Single-port laparoscopy in colorectal surgery The navel works well because it is already a thin scar in the midline, it gives a direct route to the abdomen, and an extra small scar there is nearly invisible. After tummy tucks, surgeons can also rebuild a natural-looking navel.21PubMed. Refining Abdominoplasty: A Novel Technique for Umbilical Reconstruction
Do Other Animals Have Belly Buttons
All placental mammals have a navel because they were fed by an umbilical cord.22The Conversation. Innies, outies and omphalophobia: 7 navel-gazing questions about belly buttons answered Marsupials like kangaroos and monotremes like platypuses don’t.23The Conversation. Innies, outies and omphalophobia: 7 navel-gazing questions about belly buttons answered In cats and dogs it is a flat scar hidden by fur.24The Conversation. Innies, outies and omphalophobia: 7 navel-gazing questions about belly buttons answered In whales, dolphins and orangutans it is easier to see.25The Conversation. Curious Kids: do all animals have belly buttons? Animals that hatch from eggs may have only a tiny scar from the yolk stalk.26The Conversation. Curious Kids: do all animals have belly buttons?
To find your pet’s navel, look along the midline of the belly, below the ribcage. Part the fur to find a small flat line or patch, which may look like lighter or barer skin than the surrounding coat.