Runner’s nipple, also called jogger’s nipple, is a friction injury caused by your shirt repeatedly rubbing against your nipples during a run. Over the course of thousands of strides, that constant back-and-forth contact irritates the skin, leading to soreness, redness, and in more severe cases, cracking and bleeding. It’s one of the most common complaints among distance runners, and it’s almost entirely preventable.
What Causes It
The basic mechanics are simple. Every time you take a stride, your torso moves slightly and your shirt shifts across your chest. On a short run, that’s barely noticeable. But during a long training session or a marathon, your shirt may slide across your nipples tens of thousands of times. The nipple and the surrounding areola have thinner, more sensitive skin than the rest of your chest, so they break down faster under that repeated friction.
Several factors make the problem worse. Sweat is a big one: as moisture builds up, it softens the skin and makes it more vulnerable to abrasion. At the same time, a sweat-soaked shirt becomes heavier and clings differently, changing how it drags across the skin. Cotton is particularly problematic here because it absorbs moisture and holds it against your body, and the rubbing of soaked cotton against skin is especially irritating. Hot, humid weather amplifies this by increasing how much you sweat. Rain and cold conditions can also be a factor, since wet fabric stiffens and creates more abrasive contact.
Running distance plays a direct role. The longer you run, the more cumulative friction your nipples absorb, which is why runner’s nipple is far more common in half-marathon and marathon runners than in people doing shorter distances. Higher body mass index has also been linked to greater risk, likely because a larger chest creates more surface contact between skin and fabric.
What It Looks and Feels Like
In its mildest form, runner’s nipple shows up as redness and tenderness after a run. Your nipples may feel raw or stinging, similar to a mild rug burn. You might not notice it while you’re running, especially if adrenaline and cool air mask the sensation, only to feel the sharp sting when you step into a warm shower afterward.
In moderate cases, the skin becomes visibly irritated, dry, and flaky. The area around the nipple may look chapped or develop small cracks. At its worst, the friction wears through the outer layers of skin entirely, causing open sores that bleed. This is the classic image of a marathoner crossing the finish line with visible bloodstains on their shirt. The bleeding itself isn’t dangerous, but the broken skin can be painful for days afterward and is more susceptible to infection if not kept clean.
Who Gets It
Runner’s nipple affects both men and women, though it tends to show up more visibly in men. The reason is straightforward: women who wear sports bras already have a layer of snug, moisture-wicking fabric holding everything in place, which reduces the shirt-on-skin friction that causes the problem. Research on elite female athletes has confirmed that infrequent sports bra use is associated with a higher rate of frictional breast injuries, including nipple chafing. Women who run in loose-fitting tops without a supportive bra underneath face the same risk as men in a standard running shirt.
That said, sports bras can cause their own friction issues if they fit poorly, have rough seams along the band or cup edges, or are made from abrasive material. So while a well-fitted sports bra is protective, it’s not a guaranteed shield.
How to Prevent It
Prevention comes down to one goal: eliminating friction between your shirt and your nipples. There are a few reliable ways to do that.
Choose the right fabric. Synthetic, moisture-wicking materials like polyester or nylon stay lighter when wet and move more smoothly across skin than cotton. They also dry faster, which reduces the window of time your skin is softened by moisture. If you’re running more than a few miles, skip the cotton T-shirt.
Apply a lubricant. A layer of petroleum jelly on each nipple before your run creates a slick barrier that prevents fabric from gripping the skin. Anti-chafing balms and creams designed specifically for runners work the same way. For shorter runs, a single application is usually enough. For longer distances, you may need to reapply at a midpoint, which is why some runners carry a small stick of balm.
Cover your nipples. Adhesive bandages placed directly over the nipples are one of the simplest and most effective solutions. A standard round bandage works fine. There are also products made specifically for this purpose: thin, adhesive nipple covers designed to stay put through sweat and movement. Whatever you use, make sure the adhesive is skin-safe. Avoid tape not designed for skin contact, which can either peel off mid-run or cause its own irritation when you remove it.
Get a better fit. A shirt that’s too loose flaps and drags more with each stride. A compression-style top or a shirt with a snugger fit sits closer to the body and moves with you rather than against you, reducing the repetitive rubbing. Avoid shirts with seams or stitching that run directly across the chest.
Treating It After a Run
If you’ve already developed runner’s nipple, the first step is gently cleaning the area with mild soap and lukewarm water. Pat it dry rather than rubbing. If the skin is cracked or bleeding, apply a thin layer of petroleum jelly or an antibiotic ointment and cover it loosely with a bandage to protect it from further irritation throughout the day. Wearing a soft, loose shirt while the area heals helps prevent additional friction.
Mild cases typically heal within a few days. More severe chafing with cracked or bleeding skin may take a week or more, especially if you continue running before it’s fully recovered. Each run on damaged skin resets the healing process, so it’s worth either taking a short break or being very thorough with nipple covers and lubricant if you continue training.
When It Might Be Something Else
Runner’s nipple has a clear cause-and-effect relationship: you run, your shirt rubs, your nipples get sore. If you’re experiencing nipple pain, itching, burning, or skin changes that don’t line up with friction from exercise, that’s worth paying attention to. Persistent redness, scaly patches, or ulceration of the nipple that doesn’t heal can occasionally be a sign of other conditions, including a rare form of breast disease called Paget’s disease of the nipple. A lump in the breast alongside nipple changes is another reason to get checked. These situations are uncommon, but if your symptoms don’t match a clear friction pattern or don’t improve with basic care, it’s reasonable to have a doctor take a look.