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15 Everyday Things That Can Change Your Breasts

Sometimes it seems like your breasts change right before your very own eyes—they’re bigger at certain points in your menstrual cycle, your nipples stick out when you’re turned on, and as you age, your girls may, unfortunately, head toward your knees. “Many changes are due to fluctuating hormone levels,” says Richard Bleicher, M.D., surgical oncologist and director of the Breast Fellowship Program at Fox Chase Cancer Center in Philadelphia. Other factors—diet, medications, and certain activities—can influence your dynamic duo too though. While they may not be able to predict the weather à la Mean Girls’ Karen Smith, your breasts tell you a whole lot about what’s happening in your body and your health.

The Follicular Phase
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Your menstrual cycle is divided into two halves: your follicular phase, during the first part of your cycle (your period is day one) and your luteal phase, after ovulation. During the follicular phase, especially five to seven days after your period, estrogen and progesterone levels are low and your breasts are at their minimum volume, says Jennifer Litton, M.D., associate processor of breast medical oncology at the University of Texas MD Anderson Cancer Center. Since they’re the least hormonally stimulated during this time, this is the most accurate picture of what your breasts are really like. 

The Luteal Phase
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As estrogen and progesterone levels rise following ovulation, you experience an increase in blood flow to your breasts, which can increase their fullness, nodularity, and tenderness. In a study of more than 200 premenopausal women who received mammograms in both the follicular and luteal phase, researchers found that breast density and size was greater in the luteal phase. “If you feel something unusual in your breast, track it during different times in your menstrual cycle because it may be due to changes in your hormones,” Litton says. If it doesn’t go away, have your doctor check it out.

Changes in Weight
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Your breasts are made up of breast tissue (including lobules and ducts that are called into action while breastfeeding) and fat tissue. So when you gain weight, your breasts increase in size. When you lose weight, you may notice they shrink. The amount of fat each woman gains or loses in her breasts depends on breast composition, which isn’t the same for everyone. Some women have denser breasts, which means they have more breast tissue and least fatty tissue. These women may not notice as large of a shift in breast size when they gain and lose weight as a woman who has a greater proportion of fatty tissue would. Click here for more factors that can affect your breast size and shape.

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Who could ever forget her first training bra? The changes that occur during puberty are largely due to a surge of estrogen. Breast growth is often the first sign that puberty has begun. At first a breast bud—a small raised bump under your nipple—starts to grow. Next, the nipple and areola grow larger and darken in color and over time breasts continue to grow. They don’t always sprout at the same pace—one may be larger than the other for a long time or even forever. It can take several years for your breasts to reach their full size. On average, girls get their first period about two to two-and-a-half years after breast development starts.

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The majority of changes that occur in your breasts during pregnancy prepare your body for breastfeeding. Blood vessels, ducts, and lobules in your breasts that are involved in producing and transporting milk expand and proliferate. This process can lead to tenderness, heaviness, and a significant increase in your cup size. You’ll also notice your areola and nipples expand. 

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Soon after delivery, you experience a surge in the hormone prolactin that tells the mammary glands in your breasts to produce milk. When you’re breastfeeding, many different things can stimulate prolactin and milk letdown such as a baby crying (even if it’s not yours), talking about or touching your baby, and sex. If you’re worried about leaking milk during sex, wear a bra with some absorbent nursing pads. “Even when you finish breastfeeding, your breasts will continue to express milk for at least another six months so don’t be alarmed if you still squirt out some milk with a little stimulation,” says Mary Jane Minkin, M.D., professor of obstetrics and gynecology at Yale School of Medicine.

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Your guy shouldn’t be the only one ogling your breasts during sex—check them out next time you’re getting frisky. During foreplay, your heart rate and blood pressure increase, which causes your breasts to swell and your veins to become more prominent. Your nipples become erect (yep, he’s not the only one sporting an erection!) and the areolae—the area around the nipple—expand. A Rutgers University study even identified a link between areas of the brain that respond to nipple stimulation and those connected with clitoral stimulation. This connection may explain why some women can orgasm from nipple stimulation alone (you lucky minx)!

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“Breasts are hormonally sensitive tissue so you’d think that they would become smaller after menopause because estrogen levels are lower, but that’s not actually what happens,” Minkin says. On average, women pack on over a pound per year after menopause, according to a study in Annals of Behavioral Medicine. (This is likely due to a decrease in physical activity and lean muscle mass, and shifts in hormones that cause you to store more fat in your midsection.) Unfortunately, packing on 20 pounds or more after menopause is associated with an 18 percent higher risk of breast cancer compared to women who gain little or no weight, according to a study in JAMA. As you age, you may also notice that your breasts become softer and may start to sag. Breast density decreases with age so you have a greater proportion of fatty tissue than you did when you were younger. Plus, Cooper’s ligaments—fibrous tissue that acts like an internal bra—stretch over time and may lead to drooping. Regularly sporting a supportive bra can help.

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Birth Control Pills
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“When birth control pills were first invented, they contained extremely high doses of estrogen and there were a lot of women walking around with very large breasts as a result,” Minkin says. (We’re looking at you, Joan Holloway.) Today, most contain about one-fifth of the original amount, so they don’t have as big of an effect. Still, it’s completely normal if you experience a little boost in breast size when you start birth control. “Estrogen can lead to more fluid retention and also increase breast tenderness,” Minkin adds. If it’s troublesome, talk to your doctor about other options.

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Certain meds—especially some types of anti-psychotic and antidepressant drugs—are notorious for affecting your breasts. One in particular, Risperidal, is a drug used to treat bipolar disorder and can increase prolactin levels, which may cause your breasts to leak milk even if you’re not breastfeeding, Minkin says. For women who experience breast pain around their period, non steroidal anti-inflammatory drugs (such as ibuprofen and aspirin) can help. They may work by inhibiting prostglandins that are involved in inflammation and tenderness, Bleicher says. Diuretics, often used to treat high blood pressure, can also decrease breast pain and swelling by reducing fluid retention, Minkin adds. While some minor pain and discomfort is considered normal at certain times during your cycle, talk to your doctor about issues that impact your lifestyle.

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In general, you’re unlikely to notice any changes in your breasts even with an intense weight-lifting regimen. That’s because your breasts sit on top of the pec muscle, but aren’t part of them so you can develop stronger muscles underneath your breasts without affecting their size or shape, says Melissa Crosby, M.D., associate professor of plastic surgery at the University of Texas MD Anderson Cancer Center. However, a study from researchers in England who examined breast movement during exercise found that breasts bounce as much as eight inches up and down during physical activity. They also found that wearing a sports bra reduces bounce by up to 78 percent during aerobic exercise. Want to learn more? Visit Shock Absorber. Enter your cup size and level of activity to watch wh at happens to breasts when you’re on the move.

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“I don’t know why, but spiders seem to love breasts,” Minkin says. “It can be really scary because you may develop a red, inflamed bump and women often think they have inflammatory breast cancer, when it’s just a reaction to a spider bite that can be cleared up with antibiotics.” It’s unlikely that inflammatory breast cancer (a rare, but very aggressive form of the disease) develops overnight, so if you suddenly notice redness, inflammation, and swelling it could be a bug bite, but still be sure to have you doctor look at it, Minkin adds. 

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Sad, but true: Your morning cup (or three) can take a toll on your breast health. Some women’s breast tissue is especially sensitive to caffeine and may experience fibrocystic breasts—a benign condition that can make your ta-tas feel lumpy or rope-like. For some, this can be incredibly painful and worsen around your period. Doctors don’t know why this occurs, but if you experience breast pain or “nodularity," as doctors refer to the lumpiness, try cutting out caffeine for several weeks, Minkin says. If you experience severe soreness and stemming your coffee intake doesn’t help, talk to your doctor. Low doses of the medication Danazol, normally used to treat endometriosis, acts like testosterone and lowers estrogen levels, which can help some women, Minkin says. 

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There are two techniques for inserting implants: The first and most common is under the pectoralis major muscle and the other is subglandular, or beneath the breast tissue, explains Melissa Crosby, M.D., associate professor of plastic surgery at The University of Texas MD Anderson Cancer Center. Interestingly, although breast implants are often meant to make your breasts appear larger, they can cause some of your natural breast tissue to atrophy. This may be due to the implant pressing against your breast tissue, causing the tissue to break down over time. With breast implants, you can still receive mammograms. Clinical breast exams, however, may be more challenging. “You’re mostly feeling the implant, so it’s difficult to identify abnormalities in the natural breast tissue,” Minkin says. If you have implants, discuss with your doctor the best approach for screenings. 

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Women often underestimate the impact booze can have on their breast health, Minkin says. More than 100 studies have looked at the association between alcohol consumption and breast cancer risk in women. A recent U.K. study of more than 28,000 ladies found that even low levels of alcohol consumption—less than one drink per day—increased the risk of breast cancer by about 12 percent. Scary stuff! It’s not exactly known how booze boosts your risk, but it could affect levels of hormones, such as estrogen, associated with tumor growth. Drinking may also lead to weight gain and your risk of breast cancer rises with your weight. “Stick to no more than one drink per day,” Minkin says.