Nipple tenderness is most often caused by normal hormonal shifts during your menstrual cycle, but it can also result from pregnancy, friction, medications, or less common medical conditions. The sensation ranges from mild sensitivity to sharp, burning pain, and the cause usually becomes clear once you consider the timing and any other symptoms you’re experiencing.
Hormonal Changes During Your Cycle
The most common reason for tender nipples is the rise and fall of hormones throughout your menstrual cycle. Many people begin to notice soreness around the time of ovulation, roughly two weeks before their period. The tenderness then continues until menstruation starts, at which point it typically fades within a day or two.
This pattern, called cyclical breast pain, appears to involve the interplay between estrogen and progesterone. Some research suggests that people who experience more intense cyclical soreness have relatively less progesterone compared to estrogen in the second half of their cycle. Abnormalities in prolactin, a hormone involved in milk production, may also play a role. The key feature of cyclical pain is its predictability: it shows up at roughly the same point each month, affects both sides, and resolves on its own once your period begins.
Early Pregnancy
Nipple tenderness is one of the earliest signs of pregnancy, typically appearing between 4 and 6 weeks after your last period. It feels similar to premenstrual soreness but often more intense. You may also notice that the veins across your chest become more visible, and your nipples may darken and feel like they’re standing out more than usual. The surge of hormones that sustains early pregnancy drives rapid changes in breast tissue, which is why the sensitivity can feel more pronounced than anything your regular cycle produces.
Friction and Chafing
If your nipple tenderness lines up with exercise rather than your cycle, friction is the likely culprit. Runners are especially prone to this. The repetitive motion of thousands of strides causes clothing to rub against the nipple, and the problem gets worse when shirts become heavy and wet with sweat. Cotton is notorious for causing irritation because it absorbs moisture and clings to skin. Cold weather also increases risk, since lower temperatures make nipples more erect and more exposed to rubbing.
A few changes can prevent this almost entirely. Moisture-wicking fabrics pull sweat away from your skin instead of trapping it. A snug-fitting shirt reduces the back-and-forth movement that leads to chafing. Applying petroleum jelly or an anti-chafe balm before a run creates a protective barrier. For longer runs, covering each nipple with a simple adhesive bandage is one of the most reliable fixes.
Medications That Cause Tenderness
Several classes of medication list breast or nipple tenderness as a side effect. Oral contraceptives and estrogen replacement therapy are among the most common triggers, since they directly alter your hormone levels. Certain antidepressants in the SSRI category (like fluoxetine) can cause breast pain as well. Other medications linked to tenderness include some antipsychotics, certain heart medications, and spironolactone, a blood pressure drug that has anti-androgen effects. If your tenderness started shortly after beginning a new medication, that timing is worth noting.
Nipple Tenderness in Men
Men can experience nipple tenderness too, and the most common cause is gynecomastia, a condition where breast glandular tissue enlarges. This happens when the balance between testosterone and estrogen shifts in favor of estrogen. The tissue beneath the nipple may feel like a firm, movable lump that’s tender to touch.
Gynecomastia is especially common during three life stages: shortly after birth (due to maternal hormones), during puberty when estrogen levels may temporarily rise faster than testosterone, and in later adulthood as testosterone naturally declines. Certain medications can trigger it as well, including some drugs used for heartburn, heart conditions, enlarged prostate, and fungal infections. In rarer cases, gynecomastia points to an underlying condition like a pituitary or testicular tumor, particularly if it develops suddenly in adulthood without an obvious medication cause.
Infections During Breastfeeding
If you’re breastfeeding, two infections commonly cause nipple pain, and they feel quite different from each other.
Mastitis is a bacterial infection that brings flu-like symptoms: fever, chills, body aches, and fatigue. The affected breast feels warm or hot to the touch and may look pink or red. You might notice a yellowish discharge from the nipple. The pain tends to be localized to one area and comes on relatively quickly.
Thrush is a fungal infection that produces a different set of signs. Your nipples may look pink, flaky, shiny, or cracked. The pain often includes a burning or shooting sensation deep in the breast during or after feedings. A telltale clue is white patches inside your baby’s mouth, on their cheeks, tongue, or gums, since the same fungus causes oral thrush in infants. Thrush tends to appear after weeks of previously pain-free breastfeeding, which helps distinguish it from latch-related soreness that shows up in the first days.
Simple Ways to Ease the Pain
For cyclical tenderness, a well-fitting supportive bra can reduce how much breast tissue moves throughout the day, which minimizes irritation. Some people find that wearing a soft sleep bra at night helps during the most sensitive phase of their cycle. Warm compresses applied to the chest can ease soreness, particularly if your pain includes a vasospasm component where nipples turn white and sting in cold air. Avoid applying cold to the nipples if that makes the pain worse.
For skin-related nipple irritation like dryness, flaking, or minor cracking, an unscented emollient or moisturizer helps restore the skin barrier. If the skin around your nipple looks eczema-like with redness and flaking, a short course of a mild steroid ointment (available over the counter in low strengths) can calm inflammation. These are best applied right after breastfeeding if you’re nursing, to maximize contact time before the next feed.
When Tenderness Could Signal Something Serious
The vast majority of nipple tenderness comes from benign causes. However, a rare form of breast cancer called Paget’s disease of the breast specifically affects the nipple and can initially look like a simple rash. The symptoms include itching that progresses to burning, dry or flaking skin on the nipple or areola, crusting or oozing that resembles eczema, and sometimes bloody discharge or a nipple that flattens or turns inward. The critical distinction is that this doesn’t respond to typical eczema treatments. If you’ve been treating what looks like a nipple rash and it isn’t improving, follow-up testing is warranted.
More broadly, breast pain that is persistent, well-localized to one specific spot (involving less than a quarter of the breast), and doesn’t follow your cycle pattern deserves evaluation. Pain accompanied by a lump or nipple discharge should be assessed based on those additional symptoms rather than the pain alone. Cyclical tenderness that affects both sides and comes and goes with your period is, by contrast, considered clinically insignificant in terms of cancer risk.