Gynaecomastia

What is gynaecomastia?

Gynaecomastia (also spelled gynecomastia) is the enlargement of breast gland tissue in boys and men. It develops when the balance between two groups of hormones shifts: estrogen, which encourages breast tissue to grow, and androgens such as testosterone, which normally hold that growth in check. When estrogen activity rises relative to testosterone, even for a short time, the milk-duct tissue behind the nipple can grow and become firm.

It is important to separate true gynaecomastia from a similar-looking condition called pseudogynaecomastia (sometimes called lipomastia). In pseudogynaecomastia the chest looks fuller because of fat rather than gland tissue. The two can occur together, and telling them apart is one of the main goals of a medical assessment because they are managed differently.

Gynaecomastia is common. It is most often seen at three stages of life: in newborn boys, because the mother’s hormones cross the placenta before birth; in puberty, when hormone levels change quickly; and in older men, as testosterone naturally declines and body fat, which converts androgens into estrogen, tends to increase. In many cases, particularly in newborns and teenagers, the tissue shrinks on its own without any treatment. In other cases it persists, causes discomfort or embarrassment, or points to an underlying cause that needs attention.

Although gynaecomastia itself is benign (not cancer), any new lump in the male breast should be assessed by a doctor, because male breast cancer, although rare, can look and feel similar at first.

Gynaecomastia symptoms

The main sign is a noticeable increase in the size of one or both breasts. Common gynaecomastia symptoms include:

• A firm or rubbery, disc-shaped lump of tissue directly behind the nipple, often described as feeling like a small button
• Enlargement of one breast (unilateral) or both breasts (bilateral); when both are involved, one side is frequently larger
• Tenderness, soreness or aching around the nipple, especially in the first few months
• Increased nipple sensitivity, sometimes noticed when clothing rubs against the chest
• Widening or puffiness of the areola (the darker skin around the nipple)
• In more developed cases, a rounded breast shape with a fold of skin beneath it

Symptoms tend to differ by stage. In the early phase, usually within the first year, the gland tissue is actively growing and is often tender and rubbery. Over time the tissue can become more fibrous, meaning scar-like and dense. At this later stage tenderness usually fades, but the tissue is firmer and less likely to shrink on its own, even if the underlying hormone imbalance is corrected.

Doctors also describe gynaecomastia by grade, ranging from a small amount of tissue confined to the area behind the nipple, to a larger breast with excess skin that resembles a female breast. The grade helps guide which treatment options are realistic.

Some features are not typical of gynaecomastia and should lead to medical review without delay. These include a hard, irregular or fixed lump located off to one side rather than centered under the nipple, bloody or clear discharge from the nipple, skin dimpling or ulceration, a nipple that has newly turned inward, or swollen lymph nodes in the armpit.

Causes and risk factors

Gynaecomastia causes all come back to the same mechanism: relatively more estrogen action than androgen action in breast tissue. This imbalance can happen for many different reasons.

Natural hormone changes

Physiological (normal) gynaecomastia occurs in a large proportion of newborn boys and typically settles within weeks. During puberty, the testes may briefly produce more estrogen relative to testosterone, and breast tissue can swell; this often resolves within six months to two years. In older adults, falling testosterone and rising body fat shift the balance again.

Medications and substances

Many medicines have been linked with gynaecomastia. Examples include some treatments for prostate enlargement and prostate cancer (anti-androgens), anabolic steroids and testosterone products used for bodybuilding, certain heart and blood-pressure medicines such as spironolactone and some calcium-channel blockers, some anti-ulcer medicines, certain antidepressants and antipsychotics, some HIV medicines, and certain chemotherapy drugs. Excess alcohol, marijuana, heroin and amphetamines have also been associated. Some herbal or skin products containing plant estrogens, such as lavender or tea tree oil, have been reported as possible contributors, particularly in children.

Medical conditions

Conditions that lower testosterone or raise estrogen can cause gynaecomastia. These include hypogonadism (underactive testes, as in Klinefelter syndrome or after testicular injury or infection), hyperthyroidism (an overactive thyroid gland), chronic kidney disease, cirrhosis and other liver disease, and malnutrition followed by refeeding. Rarely, tumors of the testes, adrenal glands or pituitary gland that produce hormones can be responsible, which is one reason doctors take a new case seriously.

Risk factors

• Age: newborns, adolescents, and men over about 50
• Obesity, which increases the conversion of androgens to estrogen in fat tissue
• Use of anabolic steroids or performance-enhancing hormones
• Taking one or more of the medicines listed above
• Heavy alcohol use
• Liver, kidney or thyroid disease
• Conditions affecting the testes, including Klinefelter syndrome

In a considerable number of cases, especially in adult men, no specific cause is found after testing. This is described as idiopathic gynaecomastia.

Gynaecomastia diagnosis

Gynaecomastia diagnosis begins with a conversation and a physical examination. Your doctor will ask when the enlargement started, whether it is painful, whether it affects one or both sides, what medicines and supplements you take (including over-the-counter, herbal and bodybuilding products), how much alcohol you drink, and whether you have symptoms such as reduced libido, erectile difficulty, weight change or fatigue that might point to a hormonal cause.

During the examination, the doctor gently presses the tissue around the nipple between the thumb and fingers. True gynaecomastia usually feels like a firm, mobile disc of tissue centered under the nipple, whereas pseudogynaecomastia feels soft and is spread throughout the breast without a distinct disc. The doctor may also examine the testes for size and lumps, check the thyroid, and look for signs of liver disease.

Depending on what is found, tests may include:

• Blood tests to measure testosterone, estradiol (the main estrogen), luteinizing hormone (LH), follicle-stimulating hormone (FSH), prolactin, thyroid hormones, and liver and kidney function. Tumor markers such as beta-hCG and alpha-fetoprotein may be checked if a hormone-producing tumor is suspected.
• Breast ultrasound, a painless scan using sound waves, which can confirm gland tissue and help distinguish it from fat or a suspicious mass.
• Mammography (a breast X-ray), which may be used in adults when the examination is unclear or there is concern about cancer.
• Testicular ultrasound, if the testes feel abnormal or hormone results suggest a testicular source.
• Biopsy, in which a small sample of tissue is removed with a needle and examined under a microscope. This is not needed for typical gynaecomastia but may be recommended if imaging raises concern.

Many teenagers with typical pubertal gynaecomastia and a normal examination need no tests at all, only follow-up over time. Testing is more likely in adults, in rapidly growing or painful cases, when only one side is involved, or when the history and examination suggest an underlying condition.

Gynaecomastia treatment options

The right approach depends on the cause, how long the tissue has been present, how much it bothers you, and your overall health. Gynaecomastia treatment options range from simply waiting to surgery.

Observation and treating the cause

For newborn and pubertal gynaecomastia, watchful waiting is the usual recommendation because the tissue often regresses by itself. Your doctor may suggest a review every few months to check that it is shrinking rather than growing. If a medicine is thought to be responsible, stopping or switching it, only under medical supervision, may allow the tissue to reduce, especially if it has been present for less than about a year. Treating an underlying condition such as hyperthyroidism or hypogonadism can have a similar effect. Weight loss can reduce fatty tissue but does not remove true gland tissue.

Medication

Medicines are sometimes used, usually within the first year, when the gland tissue is still tender and growing. Selective estrogen receptor modulators such as tamoxifen and raloxifene block the effect of estrogen on breast tissue and may reduce size and pain in some people. Aromatase inhibitors, which lower estrogen production, have also been tried but appear less consistently helpful. Men with confirmed low testosterone may be offered testosterone replacement. These medicines are generally used off-label for gynaecomastia, meaning they are approved for other conditions, and they carry potential side effects, so the decision is individual. Once tissue has become fibrous, medication is unlikely to make a meaningful difference.

Surgery

Surgery is usually considered when gynaecomastia has persisted for more than a year, has not responded to other measures, causes pain or significant distress, or when the person prefers a definitive solution. The two main techniques are often combined:

• Liposuction removes fatty tissue through small incisions using a thin tube and suction. It is effective for the fat component but does not remove dense gland tissue.
• Excision (surgical removal of gland tissue) is performed through an incision, often placed along the lower edge of the areola, to remove the firm gland. In larger cases with excess skin, the surgeon may also remove skin and reposition the nipple.

Surgery is typically performed by a plastic surgeon under general anesthesia or, for smaller cases, local anesthesia with sedation. Like any operation, it carries risks, including bleeding, infection, fluid collection (seroma), changes in nipple sensation, scarring, uneven contour, and the possibility that some tissue regrows, particularly if the underlying cause is not addressed. Within Acibadem, gynaecomastia surgery is managed by the Plastic, Reconstructive & Aesthetic Surgery department, usually after an endocrine or general medical assessment to rule out treatable causes.

Recovery after surgery

Most people wear a compression garment for several weeks to reduce swelling and help the skin settle. Light activity can often resume within a few days, while strenuous exercise and heavy lifting are usually delayed for several weeks according to the surgeon’s advice. Swelling and bruising gradually improve over weeks to months, and the final contour may take several months to become apparent. Scars generally fade over time but do not disappear completely.

Living with gynaecomastia and outlook

For many boys and men, the outlook is favorable. Newborn gynaecomastia almost always resolves on its own, and pubertal gynaecomastia regresses in most teenagers within a couple of years, though a minority are left with persistent tissue. When a medication or medical condition is the cause and it is addressed early, the tissue may shrink. Once tissue has been present for well over a year, spontaneous improvement becomes less likely, and surgery is the most reliable way to change the chest contour.

Gynaecomastia is generally not dangerous in itself. Its main impact is often psychological. Some people feel self-conscious, avoid swimming or sports, wear loose clothing, or experience anxiety and low mood. These feelings are common and valid, and it can help to talk with a doctor, counselor or supportive family member. Adolescents in particular may benefit from reassurance that the condition is common and usually temporary.

Practical measures that some people find helpful include maintaining a healthy weight, limiting alcohol, avoiding anabolic steroids and unregulated supplements, and reviewing any medicines with a doctor rather than stopping them independently. Compression vests can improve appearance under clothing for those not seeking, or not yet ready for, surgery.

Having gynaecomastia does not appear to substantially raise the risk of male breast cancer in most men, although men with Klinefelter syndrome have a higher risk than other men and should be alert to changes in their chest. Regardless of the cause, any new or changing lump should be assessed rather than assumed to be gynaecomastia.

Frequently asked questions

What is gynaecomastia and how is it different from chest fat?

Gynaecomastia is growth of actual breast gland tissue in males, driven by a shift in the balance between estrogen and testosterone. Chest fat, or pseudogynaecomastia, is a build-up of fatty tissue without gland growth. On examination, true gynaecomastia often feels like a firm disc under the nipple, while fat feels soft and diffuse. Because the two are treated differently, a doctor may use an examination and sometimes ultrasound to tell them apart.

What are the most common gynaecomastia symptoms?

The most common symptoms are a firm, rubbery lump behind one or both nipples, breast enlargement that may be uneven between sides, and tenderness or nipple sensitivity, particularly in the first months. Some people notice a puffier areola. Pain usually eases over time, but the tissue may remain. A hard, irregular lump off to one side, nipple discharge or skin changes are not typical and should be checked.

What are the main gynaecomastia causes in adult men?

In adult men, common causes include age-related decline in testosterone, excess body fat, medications such as anti-androgens, spironolactone and some psychiatric or stomach medicines, anabolic steroid use, heavy alcohol intake, and liver, kidney or thyroid disease. Less often, a hormone-producing tumor is responsible. In many adults no clear cause is identified even after thorough testing, which is called idiopathic gynaecomastia.

How is gynaecomastia diagnosis confirmed?

Diagnosis is usually based on a detailed history and a careful physical examination of the chest and testes. Blood tests for hormones and liver, kidney and thyroid function may be requested, and a breast ultrasound or mammogram can confirm gland tissue and rule out a suspicious mass. A biopsy is reserved for cases where imaging or examination raises concern. Typical pubertal cases often need no tests beyond follow-up.

Can gynaecomastia go away on its own?

Often, yes. Gynaecomastia in newborns nearly always disappears within weeks, and pubertal gynaecomastia resolves in most teenagers within about two years. In adults, tissue that developed because of a medication or medical condition may shrink if that cause is corrected early. Once the tissue has been present for more than a year and has become fibrous, it is less likely to disappear without treatment.

What gynaecomastia treatment options work without surgery?

Non-surgical options include monitoring over time, stopping or changing a medicine that may be responsible (with medical supervision), treating an underlying hormonal or medical condition, weight management for the fatty component, and, in selected early cases, medicines such as tamoxifen that block estrogen’s effect on breast tissue. These medicines are used off-label and tend to work best while the tissue is still tender and growing. Compression garments can improve appearance but do not remove tissue.

Is gynaecomastia surgery permanent?

Surgical removal of gland tissue is usually long-lasting, because gland tissue that has been excised does not grow back in the same way. However, results can be affected by later weight gain, continued use of anabolic steroids or causative medicines, or an untreated hormonal condition, which may lead to some recurrence. Your surgeon may recommend addressing these factors before and after the operation to help preserve the result.

When to see a doctor

Gynaecomastia is often harmless, but it is sensible to have any new breast enlargement assessed, especially in adulthood, so that the cause can be identified and any treatable condition addressed. It is also reasonable to seek advice if the enlargement is painful, is growing, has lasted more than a year, or is affecting your confidence or daily life.

Seek medical attention promptly if you notice any of the following warning signs:

• A hard, irregular or fixed lump, particularly if it is on one side and not centered under the nipple
• Bloody or clear discharge from the nipple
• Skin changes over the breast, such as dimpling, redness, thickening or ulceration
• A nipple that has newly turned inward or changed shape
• Swollen lymph nodes in the armpit or above the collarbone
• Rapid breast growth over weeks, especially in an adult
• A lump or swelling in a testicle, or a testicle that has become smaller
• Other new symptoms such as unexplained weight loss, headaches, vision changes, or signs of liver disease such as yellowing of the skin or eyes

A doctor can determine whether the change is gynaecomastia, fat, or something that needs further investigation, and can discuss which of the available treatment options, if any, is appropriate for you.