A belly button that hurts and smells usually signals one of two things: a buildup of debris that’s irritated the skin, or an active infection. Both are common, and most cases resolve with proper cleaning or a short course of treatment. But certain combinations of symptoms point to less obvious causes worth knowing about.
Debris Buildup and Navel Stones
The simplest explanation is often the right one. Your belly button is a small, warm, moist pocket that traps skin oil, dead skin cells, hair, and dirt. Over time, this debris can compact into a hard little ball called a navel stone (or omphalolith). These stones can sit unnoticed for months or even years, quietly collecting material until they’re large enough to irritate the surrounding skin. Once that happens, you may notice discomfort, an unpleasant smell, and sometimes discharge.
Navel stones are more common in people with deeper belly buttons and in those who don’t regularly clean the area. The odor comes from bacteria breaking down the trapped organic material. Removal is usually straightforward, though a hardened stone that’s been there a long time may need a doctor to extract it safely.
Bacterial and Yeast Infections
If the smell comes with yellowish discharge, redness, swelling, or tenderness, you’re likely dealing with an infection. The most common bacterial culprit is Staphylococcus aureus, which thrives in the warm, damp environment of the navel. Bacterial infections typically produce a yellow or greenish discharge that smells foul.
Yeast infections look and feel different. Candida (the same fungus behind most vaginal yeast infections) causes a bright red, itchy rash in and around the belly button. The discharge tends to be white or slightly off-white, and the smell is more sour than rotten. People with diabetes are at higher risk for belly button yeast infections, and if you get one, your doctor may recommend testing your blood sugar. Over-the-counter antifungal creams applied directly to the skin typically clear it up.
Both types of infection can develop after a minor skin break, excessive moisture from sweat, or simply not cleaning the area regularly enough. Piercing sites are another common entry point for bacteria.
Cysts and Skin Growths
A small lump inside or near the belly button that becomes painful and starts producing discharge could be an epidermal inclusion cyst (sometimes called a sebaceous cyst). These are sacs beneath the skin filled with a protein called keratin. They’re usually painless when they first form, but if bacteria get inside, the cyst becomes swollen, tender, and sometimes visibly discolored. An infected cyst can drain foul-smelling material and feel distinctly different from a general infection because you can usually feel a firm, round mass underneath the skin.
Urachal Remnants
Before you were born, a small tube called the urachus connected your bladder to your belly button. It normally closes and disappears, but in some people, part of it remains open. This leftover structure, called a urachal remnant, can take several forms: a fully open channel between the bladder and navel, a closed-off cyst filled with trapped fluid, or a sinus that opens at the belly button but dead-ends before reaching the bladder.
A urachal remnant can cause lower abdominal pain, pain when you urinate, and drainage from the belly button that may smell like urine. Many people don’t know they have one until it becomes infected in adolescence or adulthood. Diagnosis usually involves imaging such as a CT scan, and treatment often requires surgery to remove the remnant.
Umbilical Endometriosis
For people who menstruate, there’s another possibility worth considering. Umbilical endometriosis occurs when tissue similar to the uterine lining grows in or around the belly button. This tissue responds to hormonal changes the same way it does inside the uterus: it thickens, breaks down, and bleeds. But because the blood and tissue have nowhere to go, they get trapped, causing pain and swelling.
The hallmark of this condition is that symptoms sync with your menstrual cycle. You might notice belly button pain, a visible nodule or bump, skin discoloration, and reddish-brown discharge that worsens around your period. That said, some people experience constant symptoms that don’t follow a cyclical pattern. Umbilical endometriosis is rare, but it’s frequently misdiagnosed as an infection or cyst, so mentioning the cyclical pattern to your doctor can speed up the correct diagnosis.
What Diagnosis Looks Like
If cleaning doesn’t resolve the problem within a few days, a doctor will typically start by examining the area and asking about the timeline and type of discharge. For suspected infections, they’ll often swab the discharge and send it for a culture to identify whether bacteria or fungus is involved. This determines which treatment will actually work rather than guessing.
If they suspect something deeper, like a urachal remnant, cyst, or endometriosis, imaging such as a CT scan or ultrasound can reveal what’s going on beneath the surface. A biopsy of any unusual tissue may also be needed.
Cleaning Your Belly Button Properly
Many cases of belly button odor and mild irritation come down to hygiene, and the fix is simple. Clean your belly button at least once a week, though daily is fine as long as you’re gentle. Use mild, fragrance-free soap and water. Nothing else is needed.
For an innie belly button, lather soapy water onto a cotton swab or the corner of a washcloth. Gently work it around the inside to remove any buildup, then dry the area thoroughly with a clean swab or towel. For an outie, your hands or a washcloth with mild soap will do the job. The drying step matters because leftover moisture creates the exact environment bacteria and yeast love.
A few things to avoid: don’t scrub hard enough to cause tiny tears in the skin, because bacteria can enter through those breaks and cause an infection. Don’t apply body lotion inside your belly button, since the area is already naturally moist and added moisture promotes bacterial growth. And skip harsh or heavily fragranced products that can irritate the delicate skin.
Signs That Need Medical Attention
Most belly button odor is a hygiene issue. But certain symptoms suggest something that won’t resolve on its own. Redness that spreads outward from the belly button, fever, discharge that’s yellow, green, or bloody, increasing pain, or a visible lump all warrant a visit to your doctor. The same applies if you’ve been cleaning the area carefully for a week and the smell or pain hasn’t improved, or if symptoms seem to follow your menstrual cycle.