Sore nipples are almost always caused by something harmless, most commonly hormonal shifts tied to your menstrual cycle, pregnancy, or friction from clothing. Between 45% and 70% of women experience cyclical breast and nipple pain at some point during their reproductive years, making it one of the most common physical complaints. While the soreness can feel alarming, understanding the pattern and any accompanying symptoms usually points to a clear explanation.
Hormonal Shifts and Your Menstrual Cycle
The most common reason for sore nipples is the rise and fall of hormones throughout your menstrual cycle. In the days leading up to your period, rising progesterone causes breast tissue to swell and retain fluid. This makes nipples tender, sometimes to the point where even a light touch or the brush of fabric feels uncomfortable. The soreness typically peaks in the few days before your period starts and fades once bleeding begins.
Keeping a simple journal of when the soreness appears can help you spot this pattern. If the pain reliably shows up in the second half of your cycle and disappears with your period, it’s cyclical and considered normal. Birth control pills and hormone replacement therapy can also trigger this kind of sensitivity, since they directly alter your hormone levels. If the timing lines up with starting or changing a hormonal medication, that’s likely the connection.
Early Pregnancy
Nipple soreness is one of the earliest signs of pregnancy, often appearing before a missed period. Your breasts may feel larger and tender, similar to premenstrual soreness but often more intense. The nipples may tingle, darken in color, and become more prominent. Veins across the breast can also become more visible as blood flow increases to the area. If your period is late and your nipples have been unusually sore for more than a week, a pregnancy test is a reasonable next step.
Friction and Clothing Irritation
Repeated rubbing from clothing is a surprisingly common cause of nipple pain, especially for runners and other athletes. Each stride slightly shifts your shirt across your chest, and over the course of a long run, that constant micro-friction can crack and chafe the skin. Sweat-soaked shirts that cling to your body make it worse, and cold weather increases vulnerability because nipples become more erect and exposed to rubbing.
Cotton shirts are particularly notorious for this. They absorb sweat, get heavy, and create more drag against the skin. Switching to lightweight, moisture-wicking fabrics makes a real difference. For extra protection, you can apply petroleum jelly or an anti-chafe balm to your nipples before exercise, or cover them with simple adhesive bandages. If a shirt feels rough or uncomfortable when you first put it on, trust that instinct and change.
Breastfeeding-Related Pain
Some degree of nipple tenderness is normal in the first week or two of breastfeeding as your skin adjusts. But pain that persists beyond that, or that suddenly returns after weeks of comfortable feeding, usually signals a specific problem.
A shallow latch, where the baby doesn’t take enough of the areola into their mouth, is the most frequent culprit. When the baby only clamps down on the nipple itself, the concentrated pressure causes cracking, bleeding, and sharp pain. A lactation consultant can usually identify and correct latch issues in a single session.
A poor latch can also trigger nipple vasospasm, where blood vessels in the nipple tighten and restrict blood flow. This causes intense, throbbing pain that often hits after a feeding ends. The nipple may turn white or blue before flushing back to its normal color. Some people experience vasospasm unrelated to breastfeeding, as part of a condition called Raynaud’s phenomenon, where cold temperatures cause the same blood vessel constriction in the fingers, toes, and nipples.
Thrush and Bacterial Infections
Two types of infection can make nipples painfully sore, and they feel quite different from each other.
Thrush is a fungal infection that commonly develops during breastfeeding. The hallmark signs are pink, flaky, shiny, or blistered nipples paired with deep, shooting pains in the breast during or after feedings. If your baby has white patches on the inside of their cheeks, tongue, or gums, that’s a strong clue that you’re passing the infection back and forth. Thrush often appears as soreness that returns after weeks of pain-free breastfeeding.
Mastitis is a bacterial breast infection that feels more like being sick. Along with tender, warm, red skin on the breast, you may develop a fever, chills, body aches, and fatigue. There may also be a yellowish nipple discharge. Mastitis typically requires prompt treatment and tends to come on quickly, within a day or two.
Medications That Cause Nipple Sensitivity
Several types of medication list breast or nipple pain as a side effect. Oral contraceptives and estrogen therapy are the most obvious, but the list also includes certain antidepressants (particularly SSRIs like fluoxetine), some antipsychotic medications, certain blood pressure drugs, and diuretics (water pills). If your nipple soreness started or worsened around the same time you began a new medication, bring that up with whoever prescribed it. A dosage adjustment or alternative drug may resolve the issue.
Simple Ways To Ease the Soreness
For cyclical, hormone-related soreness, a well-fitted supportive bra is the single most practical change you can make. Over-the-counter pain relievers like ibuprofen work well for flare-ups, and a topical anti-inflammatory cream applied directly to the sore area can help when the pain is more intense.
Some women find that reducing caffeine intake helps, though the evidence on this is mixed. A low-fat diet with more complex carbohydrates has shown benefit in observational studies. Evening primrose oil, which may shift the balance of fatty acids in your cells, is one supplement with some support behind it. Vitamin E (200 IU twice daily) improved symptoms in one study of women with cyclical breast pain over a two-month period. If you try a supplement, stick with one at a time so you can tell whether it’s actually helping.
Relaxation techniques can also make a difference, particularly if anxiety amplifies your perception of pain, which research suggests it does with breast and nipple soreness.
Signs That Need Medical Attention
Most nipple soreness resolves on its own or with simple adjustments. But certain combinations of symptoms warrant a closer look. Nipple discharge that isn’t breast milk, especially if it’s bloody or comes from only one side, is worth getting checked. The same goes for a lump in the breast, skin that changes color or texture, a nipple that flattens or turns inward, or soreness accompanied by fever.
In rare cases, persistent nipple changes can point to Paget’s disease of the breast, a type of cancer that initially resembles eczema. It typically affects only one breast and causes itching that progresses to burning, along with dry, flaking, crusting, or weeping skin on the nipple or areola. Symptoms may seem to come and go at first but gradually worsen. Because it looks so much like a common rash, it’s often misidentified early on. Nipple soreness that doesn’t respond to typical remedies, keeps getting worse, or comes with visible skin changes is the kind that deserves a professional evaluation sooner rather than later.