Sore nipples are extremely common, and the cause is usually straightforward. About 68% of women experience cyclical breast and nipple discomfort tied to their menstrual cycle alone, with roughly 22% rating that discomfort as moderate to severe. Beyond hormonal shifts, friction, pregnancy, breastfeeding difficulties, skin irritants, and infections can all make your nipples tender or painful. Here’s how to figure out what’s behind yours and what actually helps.
Hormonal Changes Throughout Your Cycle
The most common reason for nipple soreness is hormonal. During the second half of your menstrual cycle (after ovulation), estrogen and progesterone levels shift in ways that cause breast tissue to swell and retain fluid. When estrogen runs high relative to progesterone, nipple tenderness tends to peak. A 2024 study tracking over 670 ovulatory cycles found that both breast tenderness and swelling hit their maximum in the late luteal phase, roughly the week before your period starts, and the two symptoms were closely correlated.
This kind of soreness is symmetrical (both sides), comes and goes with your cycle, and resolves once your period begins. If your soreness follows that pattern, it’s almost certainly hormonal and nothing to worry about. Hormonal birth control can sometimes make it better or worse depending on how it shifts your estrogen and progesterone balance.
Early Pregnancy
Nipple soreness is one of the earliest signs of pregnancy. It can show up as soon as two weeks after conception, though it more commonly appears between weeks four and six. The sensation is similar to premenstrual tenderness but often more intense, and it doesn’t go away when your period would normally start.
The culprit is a rapid increase in hormones combined with a significant rise in blood volume. Your body begins preparing breast tissue for milk production almost immediately after implantation. The nipples and areolas may also darken in color and feel more sensitive to touch than usual. If your soreness appeared around the time you expected your period and your period never came, a pregnancy test is the logical next step.
Friction and Chafing
If you’re a runner, cyclist, or anyone who exercises in a shirt that rubs, friction is a likely cause. This is sometimes called “jogger’s nipple,” and it happens when repetitive motion drags fabric across the skin for an extended period. Cotton shirts are particularly bad because they absorb sweat, get heavy, and create more abrasion as they cling to your body.
Prevention is simple. Switch to lightweight, moisture-wicking fabrics for exercise. Apply petroleum jelly or an anti-chafing balm to your nipples before a workout to create a barrier between skin and fabric. Adhesive nipple covers or sports tape work well too. If you’re already dealing with raw, chafed nipples, keep the area clean and dry and let it heal before your next workout.
Breastfeeding Pain
Nipple soreness during breastfeeding is one of the top reasons new parents stop nursing earlier than planned. The most frequent cause is positioning: when a baby doesn’t latch deeply enough, the nipple gets compressed against the hard palate instead of drawn back toward the soft palate. This creates intense, pinching pain that starts the moment the baby latches and may ease slightly as the feeding continues.
Other mechanical causes include tongue-tie (where the baby’s tongue movement is restricted), flat or inverted nipples that make latching harder, and palate variations in the baby’s mouth. A lactation consultant can evaluate the latch and often resolve the problem in a single visit.
When soreness persists even after correcting the latch, infection becomes more likely. Signs that point toward infection rather than a mechanical problem include redness or pinkness that doesn’t fade, swelling, skin that looks shiny or has a white, sloughy appearance, or satellite lesions (small spots spreading outward from the nipple). Mastitis, a deeper breast infection, adds flu-like symptoms, fever, and a hot, wedge-shaped area of redness on the breast.
Healing Sore Nipples From Nursing
Lanolin cream is the most widely used topical treatment. It’s safe for the baby (no need to wipe it off before feeding) and research shows it heals nipple cracks faster than expressed breast milk alone, with meaningful reductions in pain within about three days. Silver nursing cups, small caps worn inside your bra between feedings, are another option. A clinical trial found that women using silver caps experienced significantly faster pain relief at both 7 and 15 days compared to standard care. You wash the nipple after feeding, place the cup over it, and wear it until the next session. Many women use both lanolin and silver cups together.
Contact Irritants and Allergic Reactions
Your nipples have thinner, more sensitive skin than most of your body, which makes them especially vulnerable to chemical irritants. Laundry detergent is one of the most overlooked culprits. Synthetic fragrances (ingredients like limonene and linalool), dyes that give detergent its color, preservatives like parabens, and surfactants like sodium lauryl sulfate can all trigger a localized skin reaction.
The pattern here is distinctive: soreness, itching, or a rash that appears on both nipples and corresponds to fabric contact. It may worsen when you wear certain bras or shirts and improve when you go braless or switch garments. If you suspect a detergent allergy, try switching to a fragrance-free, dye-free formula and washing your bras separately. Body soaps, lotions, and even the material of a new bra can cause the same reaction.
Yeast Infections
A yeast infection on the nipple causes a burning, stinging pain that often continues between feedings or persists throughout the day, not just during contact. The skin may look red, cracked, or swollen around the nipple and areola. It’s most common in breastfeeding women, but anyone can develop one, especially after a course of antibiotics or in warm, moist conditions.
Yeast infections don’t resolve on their own and typically need antifungal treatment. If you’re breastfeeding and your baby has white patches inside the mouth (oral thrush), the infection is likely passing back and forth between you, and both of you need to be treated at the same time.
When Soreness Signals Something Serious
Paget disease of the breast is a rare form of cancer that begins in the nipple and can look deceptively similar to eczema or dermatitis. The key differences: it almost always affects only one nipple, it doesn’t respond to moisturizers or steroid creams, and it gets progressively worse over weeks to months. Symptoms include persistent itching or tingling, flaking or crusty skin on or around the nipple, a nipple that gradually flattens, and discharge that may be yellowish or bloody. Some people also have a lump in the same breast.
Paget disease accounts for a small percentage of breast cancers, but it’s frequently misdiagnosed as a skin condition, which delays treatment. If you have a persistent, one-sided nipple change that isn’t healing, getting it evaluated with a biopsy is the only way to rule it out.
Sorting Out the Cause
A few questions can help you narrow things down quickly. Is the soreness on both sides or just one? Hormonal causes, friction, and contact irritants are almost always bilateral. A problem on one side only raises the index of suspicion for infection, injury, or something that needs medical evaluation. Does it come and go with your cycle? That points to hormones. Did it start after a change in detergent, soap, bra, or exercise routine? That points to an external trigger.
Timing matters too. Soreness that appeared suddenly in both nipples around the time of a missed period suggests pregnancy. Pain that began with breastfeeding and worsens during feeds suggests a latch problem. A burning sensation that persists all day, especially with visible skin changes, suggests infection. And a slow, one-sided change that won’t heal warrants prompt medical attention regardless of how minor it looks.