Nipple pain is extremely common and usually tied to hormonal shifts, friction, or skin irritation rather than anything serious. The cause depends a lot on timing: when the pain started, whether it lines up with your menstrual cycle, and whether you notice any visible skin changes. Here’s a breakdown of the most likely reasons and what to pay attention to.
Hormonal Shifts During Your Cycle
The most common reason for nipple and breast soreness is your menstrual cycle. Breast tissue contains receptors for both estrogen and progesterone, making it highly responsive to hormonal fluctuations throughout the month. During the first half of your cycle, estrogen drives the growth of milk ducts. After ovulation, progesterone takes over and stimulates gland formation, triggering the most intense cell activity in breast tissue all cycle long.
This surge in progesterone during the second half of the cycle (the luteal phase) is what causes swelling, tenderness, and sometimes sharp nipple sensitivity in the week or two before your period. Many people notice their breasts feel heavier, slightly swollen, or even asymmetrical during this window. If your nipple pain comes and goes on a roughly monthly pattern, hormones are the overwhelmingly likely explanation. The discomfort resolves once your period starts and hormone levels drop.
Early Pregnancy
Breast and nipple tenderness is one of the earliest signs of pregnancy, often showing up before a missed period. The sensation feels similar to premenstrual soreness but tends to be more intense and persistent. You may also notice that your nipples darken, the veins across your chest become more visible, and your breasts feel fuller or tingly. If your soreness hasn’t followed its usual cyclical pattern and you could be pregnant, a home test is a straightforward next step.
Friction and Chafing
Repeated rubbing from clothing is a surprisingly common culprit, especially if you run, cycle, or do other repetitive-motion exercise. Known as jogger’s nipple, this happens when fabric drags across the skin long enough to create small fissures. Cotton shirts are particularly problematic because they absorb sweat, get heavy, and cling to the chest. Cold weather makes things worse by causing nipples to become more erect and exposed to rubbing. Even a stiff shirt logo sitting in the wrong spot can do damage over a long workout.
Prevention is straightforward. Moisture-wicking fabrics pull sweat away from your skin and are less likely to stick and chafe. A snug-fitting shirt reduces the back-and-forth movement that causes friction. Adhesive bandages placed over each nipple before exercise act as a simple barrier, and petroleum jelly or anti-chafe balms create a lubricating layer that protects the skin. A well-fitting sports bra also helps.
Medications That Cause Breast Pain
Several common medications list breast or nipple pain as a side effect. Oral contraceptives and hormone replacement therapy are the most frequent offenders, since they directly alter your estrogen and progesterone levels. Certain antidepressants (SSRIs like fluoxetine), some antipsychotic medications, and the blood pressure drug spironolactone can also cause breast tenderness. If your nipple pain started around the same time you began or changed a medication, the timing is worth mentioning to whoever prescribed it.
Infections: Thrush and Mastitis
If you’re breastfeeding, two infections can cause significant nipple pain, and they feel quite different from each other.
Thrush is a fungal infection. It typically causes pink, flaky, shiny, or cracked nipples that itch or burn. You might also feel shooting pains deep in the breast during or after feeds. A telltale sign is white patches inside your baby’s mouth. Thrush often appears after weeks of previously pain-free breastfeeding, which distinguishes it from latch-related soreness that starts from day one.
Mastitis is a bacterial breast infection. It comes on more like an illness: fever, chills, body aches, and fatigue alongside a breast that feels hot, swollen, and red. You may notice a yellowish discharge from the nipple. Mastitis tends to affect one specific area of the breast rather than the nipple alone.
Nipple Vasospasm
Sometimes nipple pain occurs because the small blood vessels in the nipple constrict suddenly, cutting off blood flow temporarily. This is called vasospasm, and it causes a sharp, burning pain during or after breastfeeding, or sometimes between feeds. The nipple may turn white or blue before flushing back to its normal color. Common triggers include cold air exposure, nipple damage from a poor latch, or an existing infection like thrush. Keeping your chest warm and addressing any underlying latch issues are the main ways to reduce episodes.
Soothing Sore Nipples
For general nipple soreness, warm or cool compresses applied to the area can provide relief. Over-the-counter pain relievers like ibuprofen or acetaminophen help with inflammation and discomfort. Air-drying the nipples after showering or feeding, rather than rubbing them with a towel, reduces further irritation. Breast shields can protect sensitive nipples from clothing contact throughout the day.
Lanolin cream is widely recommended for breastfeeding-related nipple pain, but the evidence behind it is weaker than most people assume. A randomized controlled trial published in Maternal & Child Nutrition found that lanolin applied after every feed did not significantly decrease nipple pain compared to standard care. A Cochrane review reached the same conclusion: no single topical treatment has proven superior for nipple pain or damage. Lanolin won’t hurt, but it’s not a guaranteed fix. Correcting the underlying cause, whether that’s a poor latch, friction, or infection, matters more than any cream.
Signs That Need Medical Attention
Most nipple pain is benign, but certain symptoms warrant a closer look. Bloody or straw-colored discharge from one nipple, especially if it happens on its own without squeezing, is a red flag. Skin changes that look like eczema but won’t heal, particularly flaking, crusting, or hardening of the skin on one nipple, can be a sign of Paget’s disease of the breast, a rare condition linked to an underlying breast cancer. Key features include a burning or itching sensation, a nipple that turns inward, and symptoms that affect only one side.
A palpable lump alongside nipple pain, any spontaneous one-sided discharge, or persistent skin changes that don’t respond to basic care all justify getting an evaluation. These symptoms don’t automatically mean something serious, but they’re the specific scenarios where imaging or further workup can rule out uncommon causes and give you a clear answer.