Nipple pain stems from a wide range of causes, and the vast majority are not dangerous. Friction from clothing, hormonal shifts across the menstrual cycle, skin irritation, and breastfeeding difficulties account for most cases. Less commonly, infections, vascular spasms, or inflammatory conditions are responsible. The nipple is densely innervated with smooth muscle nerve fibers and specialized sensory channels, which helps explain why even minor irritation there can feel disproportionately intense.1PubMed. The sensory innervation of the human nipple
Friction, Clothing, and Exercise
The most common and most easily fixed cause of sore nipples is plain mechanical irritation. Rough fabric, poorly fitting bras, or repetitive rubbing during physical activity can chafe the nipple enough to cause stinging, dryness, or even cracked skin. Runners sometimes call it “jogger’s nipple,” and it tends to be worse in cold or wet conditions when the skin is already stiff. A study of elite female athletes found that frictional breast injuries were reported at higher rates among older athletes and those with larger breasts.2PubMed Central. The Occurrence, Causes and Perceived Performance Effects of Breast Injuries in Elite Female Athletes
If friction is the culprit, the fix is usually straightforward: switch to a sports bra with smooth seams, apply a barrier product like petroleum jelly before exercise, or cover the nipples with soft adhesive bandages. Synthetic moisture-wicking fabrics help more than cotton, which stays wet and abrasive.
Hormonal Fluctuations
Hormones are probably the second most common explanation for cyclical nipple tenderness. In the days before a period, rising progesterone causes fluid retention in breast tissue, which stretches the surrounding nerves and makes both the breast and the nipple feel sore or swollen. This type of pain tends to be bilateral, meaning it affects both sides, and it resolves once menstruation starts and hormone levels drop.
Puberty causes a similar pattern. Breast buds developing under the nipple can make the area feel tender or sharp for months at a time, and this applies to boys as well as girls. Perimenopause, when estrogen and progesterone become unpredictable, often reintroduces breast and nipple soreness in people who had not experienced it since adolescence. Hormonal contraceptives and hormone replacement therapy can also trigger or worsen the symptom. The hallmark of hormone-driven nipple pain is its cyclical timing: it comes and goes in rhythm with hormonal changes rather than persisting constantly.
Breastfeeding Difficulties
Nipple pain during breastfeeding is extremely common, especially in the first weeks. The most frequent cause is a poor latch, where the baby does not take enough of the areola into the mouth and instead compresses just the nipple tip. This creates intense, pinching pain that typically peaks at the start of a feeding session. A common structural factor behind persistent latch problems is tongue-tie, a condition where the tissue anchoring the baby’s tongue to the floor of the mouth is unusually tight or short. Tongue-tie restricts the baby’s ability to extend the tongue over the lower gum, leading to inefficient milk extraction and maternal nipple pain.3PubMed Central. What is tongue-tie and does it interfere with breast-feeding? – a brief review A systematic review confirmed that tongue-tie is widely recognized as a cause of poor latch and pain during nursing.4PubMed. Systematic review of the evidence for resolution of common breastfeeding problems-Ankyloglossia (Tongue Tie)
Beyond latch issues, breastfeeding introduces opportunities for infection that amplify pain. Cracked or damaged nipple skin gives bacteria and yeast a route inward, and the warm, moist environment of nursing is ideal for microbial growth.
Infections That Target the Nipple
Two organisms deserve separate attention when it comes to nipple infections during lactation. Candida, the yeast behind oral thrush in babies, can colonize the nipple and milk ducts, producing a burning, stabbing pain that continues between feedings rather than occurring only during them. A cohort study of breastfeeding women in Melbourne found that Candida in nipple, breast milk, or baby oral samples roughly doubled the likelihood of developing nipple and breast pain symptoms. Nipple damage was an independent predictor as well, meaning cracks in the skin and yeast together created a compounding effect.5BMJ Open. Does Candida and/or Staphylococcus play a role in nipple and breast pain in lactation? A cohort study in Melbourne, Australia
Staphylococcus aureus, the bacterium behind staph infections, is the other frequent offender. A study of breastfeeding women found that the risk of staph colonization was nearly five times greater when nipple pain was moderate or severe compared with mild. When the skin had visible cracks, fissures, or ulcers, the chance of finding staph jumped to about 35%, again roughly five times higher than when the nipple skin was intact.6PubMed Central. Staphylococcus aureus and sore nipples The practical takeaway is that broken skin invites bacterial colonization, which then worsens the pain and delays healing. Keeping the nipple as intact as possible through correct latch technique and prompt treatment of cracks helps prevent this feedback loop.
These infections are not exclusive to breastfeeding. Nipple piercings, eczema-related skin breakdown, and even vigorous friction can create openings for bacteria and yeast in anyone.
Eczema and Contact Dermatitis
The nipple and areola are susceptible to the same skin conditions that affect the rest of the body, though people often do not think to connect the two. Nipple eczema can be atopic (part of a broader eczema tendency), irritant-based (triggered by detergents, fabrics, or body products), or allergic (a reaction to a specific substance like nickel in a bra underwire or a fragrance in lotion). A systematic review noted that nipple eczema in any of these forms frequently reduces quality of life.7PubMed. Nipple eczema: A systematic review and practical recommendations
Symptoms include itching, burning, flaking, and cracking of the nipple skin, sometimes with oozing or crusting. In breastfeeding women, nipple eczema produces sore, burning areolae and nipples that mimic the feel of an infection, making it easy to misdiagnose. Management centers on identifying and eliminating the offending irritant or allergen, combined with a short course of topical corticosteroid cream.8PubMed. Nipple and areolar eczema in the breastfeeding woman If you notice that the skin around your nipple is red, scaly, or cracked and it does not improve with moisturizer alone, a dermatologist can help distinguish eczema from infection or from the rarer conditions described below.
Raynaud’s Phenomenon of the Nipple
If your nipple turns white, then blue, then red after exposure to cold or during breastfeeding, and the color changes come with sharp, throbbing pain, you may be dealing with Raynaud’s phenomenon. This is a vascular condition in which small blood vessels constrict excessively in response to cold or stress, temporarily cutting off blood flow. It is best known for affecting fingers and toes, but it can also target nipple blood vessels.9Obstetrics & Gynecology. Raynaud’s Phenomenon of the Nipple
A case series documented 12 breastfeeding women with extremely painful nursing sessions precipitated by cold temperatures, all showing the characteristic two- or three-phase color change from white (blanching) to blue or red. Half of them had already experienced the symptoms during pregnancy, before any breastfeeding began.10PubMed. Raynaud’s phenomenon of the nipple: a treatable cause of painful breastfeeding The condition is treatable. Keeping the chest warm, avoiding sudden cold exposure, and in some cases taking a calcium channel blocker prescribed by a doctor can reduce the vasospasm episodes. Raynaud’s of the nipple is probably underdiagnosed because many people, including some clinicians, do not realize it can happen outside the hands and feet.
Nipple Pain in Men and Nonbinary People
Nipple pain is often framed as a women’s health issue, but it affects people of all genders. In men and those assigned male at birth, one of the more common causes is gynecomastia, the benign enlargement of glandular tissue behind the nipple. At least 30% of males are affected at some point in their lives.11PubMed Central. Gynecomastia: Clinical evaluation and management It is driven by an imbalance between estrogen and androgen activity, which can result from puberty, aging, certain medications (especially some blood pressure drugs, anti-androgens, and anabolic steroids), or conditions affecting the liver or thyroid.
Gynecomastia typically presents as a firm, rubbery disc of tissue directly beneath the nipple, and it often hurts to touch. The tenderness comes from the gland tissue swelling and pressing against surrounding structures. In adolescents, it usually resolves on its own within a year or two. In adults, treatment depends on the underlying cause. If a medication is responsible, switching drugs often helps. Persistent or distressing cases may be treated with medication or surgery. Importantly, nipple pain in men that comes with visible skin changes, bloody discharge, or a hard lump that is off-center from the nipple warrants evaluation to rule out male breast cancer, which is rare but does occur.
Rarer but Serious Causes
Paget’s disease of the nipple is an adenocarcinoma of the nipple skin that looks deceptively like eczema or dermatitis. It typically presents as persistent redness, flaking, crusting, or erosion on one nipple that does not respond to standard topical treatments.12PubMed Central. Mammary Paget’s Disease of the Nipple: Relatively Common but Still Unknown to Many Because it mimics benign skin conditions so convincingly, it sometimes goes misdiagnosed for months while patients cycle through creams and ointments. The distinguishing clue is that it is almost always unilateral, meaning it affects only one nipple, and it does not improve with eczema treatment. Any one-sided nipple skin change that persists for more than a few weeks despite treatment deserves a biopsy.
Idiopathic granulomatous mastitis is another uncommon inflammatory condition. It produces a painful, tender, often red breast mass, typically on one side, and the cause is unknown in many cases. It can be associated with autoimmune processes or less commonly with infections.13Journal of Breast Imaging. Idiopathic Granulomatous Mastitis of the Breast: Radiologic–Pathologic Correlation Because its imaging appearance can mimic cancer, diagnosis often requires a tissue sample. Treatment varies but may include corticosteroids, antibiotics if an infectious cause is found, or watchful waiting.
Changes in Sensation After Surgery
Breast or chest surgery of any kind, from lumpectomy to breast augmentation to gender-affirming mastectomy, can alter nipple sensation in ways that range from numbness to hypersensitivity and pain. Nerves that supply the nipple run through the breast tissue and are vulnerable to stretching, compression, or cutting during a procedure. When a damaged nerve regenerates improperly, it can fire pain signals in response to light touch, temperature changes, or even clothing contact.
Research on sensation recovery after gender-affirming mastectomy has shown that targeted nerve repair during surgery significantly improves long-term outcomes. In a study comparing patients who received nerve reconnection to those who did not, the nerve repair group recovered touch, temperature, and pressure-pain detection to near-baseline levels by 12 months, while the standard surgery group remained substantially less sensitive. The patients who received nerve repair also reported better subjective nipple sensation and erogenous feeling.14PubMed Central. Targeted Reinnervation During Gender-Affirming Mastectomy and Restoration of Sensation For anyone considering breast or chest surgery, asking the surgeon about nerve-sparing or nerve-repair techniques is worth the conversation, since sensory outcomes can differ dramatically depending on surgical approach.
The Anxiety Connection
Breast and nipple pain have an interesting and sometimes misunderstood relationship with anxiety. A study of women with mastalgia (the clinical term for breast pain) found that anxiety levels were significantly higher in women experiencing breast pain compared to a control group. However, and this is the part that surprised the researchers, the severity of the pain itself did not increase in proportion to how anxious a person was. In other words, more anxious people were more likely to have breast pain, but among people with breast pain, being very anxious did not make the pain feel worse.15PubMed Central. Relation between Mastalgia and Anxiety in a Region with High Frequency of Posttraumatic Stress Disorder
This finding pushes back against the common dismissal that breast or nipple pain is “just stress.” The pain is real and has a physical basis, but there does appear to be some shared biology between anxiety and breast pain susceptibility. Stress hormones can alter fluid retention, muscle tension, and nerve sensitivity, all of which feed into breast tenderness. Treating anxiety will not necessarily eliminate the pain, but managing both together may give better results than chasing one cause while ignoring the other.
Why Nipple Skin Is So Sensitive in the First Place
Understanding why the nipple reacts so strongly to minor insults helps put all of these causes in context. Research into nipple innervation has found that contrary to what was long assumed, the nipple surface does not have the dense network of superficial touch receptors found on fingertips. Instead, its extreme sensitivity comes from two other structures: a rich supply of nerves woven through the smooth muscle deep in the nipple’s dermis, and specialized pressure-sensing channels called Piezo2 expressed in the breast gland cells themselves.1PubMed. The sensory innervation of the human nipple The Merkel cells on the nipple’s surface, which help detect light touch, are relatively scarce and decrease further with age.
This anatomy means that nipple pain often originates deeper than you might think. Surface damage from cracking or chafing is painful partly because it exposes the deeper nerve structures to stimuli they are not designed to handle directly. It also explains why conditions like Raynaud’s, which involves blood vessel constriction deep in the tissue rather than surface damage, can produce such intense pain despite no visible skin changes. And it explains why surgical disruption of the nerves supplying the smooth muscle layer has such an outsized effect on overall nipple sensation.
Practical Sorting for When You Are Not Sure
If you are dealing with nipple pain and trying to figure out where it fits among all these possibilities, a few distinguishing features help narrow things down:
- Both sides, cyclical timing: hormonal shifts are the most likely explanation, especially if the soreness correlates with your menstrual cycle or a recent change in birth control.
- Both sides, constant: friction from clothing or exercise, medication side effects, or a systemic condition like eczema.
- One side, skin changes: if redness, scaling, or erosion on a single nipple does not improve within a few weeks, get it evaluated to rule out Paget’s disease or another localized condition.
- Pain with color changes: white-blue-red shifts triggered by cold point strongly toward Raynaud’s phenomenon.
- Burning between breastfeedings: yeast infection is high on the list, especially if your baby has oral thrush.
- Pain with a palpable lump underneath: could be gynecomastia, a cyst, an abscess, or in rare cases something that needs imaging.
Nipple pain that comes with bloody or spontaneous discharge, a new retraction of the nipple, or a mass that does not go away with your cycle should always be evaluated by a healthcare provider. These features do not automatically mean cancer, but they fall outside the category of “wait and see.” For the vast majority of people, though, nipple pain traces back to something mechanical, hormonal, or infectious that can be identified and addressed without too much difficulty once you know what to look for.