Gynecomastia in Men: Causes, Symptoms, Risk Factors & Diagnosis

Changes in the appearance of the male chest can cause concern, embarrassment, or uncertainty,especially when enlargement develops without an obvious explanation. One possible cause is gynecomastia, a common condition involving an increase in glandular breast tissue in boys or men.

Although gynecomastia in men is usually benign, it can sometimes be associated with medications, hormonal changes, substance use, or an underlying medical condition. It is also important to distinguish true gynecomastia from chest enlargement caused primarily by excess fat.

Understanding what gynecomastia in men is, why it develops, its common symptoms, and how doctors diagnose it can help individuals decide when medical advice may be appropriate.

What Is Gynecomastia in Men?

Gynecomastia is the benign enlargement of glandular breast tissue in males. It can affect one breast or both breasts, and the enlargement may be symmetrical or more noticeable on one side.

The condition generally develops when the balance between estrogen activity and androgen activity,particularly testosterone,changes in a way that stimulates breast tissue growth. Men naturally produce both hormones, but testosterone usually has the stronger influence on male physical development. If estrogen activity becomes relatively more dominant, glandular breast tissue may increase.

The gynecomastia meaning is therefore more specific than simply having a larger chest. True male gynecomastia involves the growth of firm or rubbery glandular tissue, usually concentrated beneath or around the nipple.

Gynecomastia may occur temporarily during natural stages of hormonal change, such as puberty, or persist because of age, medications, health conditions, or other contributing factors.

How Is Gynecomastia Different From Chest Fat?

Gynecomastia is frequently confused with excess chest fat, but the two conditions are different.

True gynecomastia involves enlarged glandular breast tissue. The area may feel firm, rubbery, or disc-shaped beneath the nipple and may sometimes be tender.

Chest enlargement caused mainly by fatty tissue is known as pseudogynecomastia. It is commonly associated with excess body weight and usually feels softer and more diffuse across the chest.

Some men may have a combination of glandular tissue and excess fat, making it difficult to determine the cause based on appearance alone. A medical examination is often the most reliable way to distinguish between the two.

How Common Is Gynecomastia?

Gynecomastia is relatively common and may develop at several stages of life.

It is frequently seen in:

• Newborn boys because of temporary exposure to maternal hormones.

• Adolescent boys undergoing puberty.

• Adult men experiencing hormonal or health-related changes.

• Older men as testosterone levels decline and body composition changes.

Estimates vary depending on age and the population being studied. Pubertal gynecomastia is particularly common and often improves naturally within several months to a few years.

Gynecomastia in adults may be related to aging, medication use, underlying disease, weight gain, hormonal conditions, or no clearly identifiable cause.

What Causes Gynecomastia in Men?

When people ask what causes gynecomastia in men, the answer often involves a change in the balance between estrogen and testosterone activity.

Estrogen promotes breast tissue growth, while androgens such as testosterone generally limit it. Gynecomastia can develop when estrogen activity increases, testosterone production decreases, androgen activity is blocked, or the body processes these hormones differently.

In some cases, no specific cause is found even after a medical evaluation.

Naturally Occurring Hormone Imbalances

Hormonal changes can occur naturally at different stages of life.

Newborn gynecomastia: Temporary breast enlargement may develop because of exposure to maternal estrogen before birth. It usually resolves without treatment.

Pubertal gynecomastia: Hormone levels fluctuate during puberty. Temporary changes in the estrogen-to-androgen balance may stimulate breast tissue growth. The condition often improves as hormone levels stabilize.

Age-related gynecomastia: Testosterone levels may gradually decline with age. At the same time, an increase in body fat can raise the conversion of androgens into estrogen, contributing to male gynecomastia.

Hormone imbalances may also occur because the testicles do not produce enough testosterone or because another condition changes hormone production or metabolism.

The Presence of Certain Tumors and Other Conditions

Rarely, tumors may contribute to gynecomastia by producing hormones or substances that affect hormone production.

Examples may include certain tumors involving the:

• Testicles.

• Adrenal glands.

• Pituitary gland.

• Lungs.

• Liver.

Some tumors can produce human chorionic gonadotropin or other hormones that stimulate estrogen production or disrupt the normal testosterone-estrogen balance.

Most cases of gynecomastia are not caused by cancer. However, unusual breast changes or symptoms suggesting a hormonal disorder should be evaluated medically.

Medical Conditions Associated With Gynecomastia

Several medical conditions may be associated with gynecomastia causes, including:

• Low testosterone or hypogonadism.

• Hyperthyroidism.

• Chronic liver disease or cirrhosis.

• Chronic kidney disease.

• Malnutrition.

• Klinefelter syndrome.

• Testicular disorders.

• Pituitary or adrenal conditions.

• Significant hormonal abnormalities.

Liver and kidney disease may affect the way hormones are produced, broken down, or removed from the body. Thyroid disorders may also alter hormone-binding proteins and contribute to breast tissue growth.

Gynecomastia may additionally be associated with certain medications. These can include some treatments used for prostate conditions, heart disease, high blood pressure, stomach disorders, psychiatric conditions, infections, or hormonal diseases.

People should not stop prescribed medication without speaking to their doctor. If a medication is suspected, the treating physician can assess whether an alternative is appropriate.

Lifestyle and Environmental Factors

Lifestyle factors and exposure to certain substances may contribute to gynecomastia in some men.

Possible factors include:

• Anabolic steroid use.

• Non-prescribed testosterone or hormone use.

• Heavy alcohol consumption.

• Recreational drug use.

• Exposure to estrogen-containing substances.

• Significant weight gain.

• Use of supplements containing undeclared hormonal ingredients.

Anabolic steroids may be especially relevant because external androgen use can disrupt the body’s natural testosterone production and alter estrogen activity.

Obesity does not always cause true gynecomastia, but excess body fat may produce pseudogynecomastia and increase the conversion of androgens into estrogen. As a result, some men may develop both fatty and glandular enlargement.

Who Is at Risk of Developing Gynecomastia?

Gynecomastia can affect males at any age, but certain biological, medical, and lifestyle factors may increase the likelihood of developing it.

Age-Related Risk Factors

The condition is especially common during periods of hormonal transition.

Risk is higher during:

• Infancy.

• Puberty.

• Older adulthood.

Pubertal gynecomastia commonly develops between early and late adolescence. It may affect one or both sides and can initially cause tenderness.

In older adults, declining testosterone, medication use, chronic health conditions, and changes in body composition can all contribute to breast enlargement.

Obesity and Weight Changes

Obesity can increase male chest size through excess fat accumulation, resulting in pseudogynecomastia. It may also influence hormone metabolism because fatty tissue contains an enzyme that converts some androgens into estrogen.

Rapid weight gain may make chest enlargement more noticeable. Significant weight loss may reduce fatty tissue but may not eliminate glandular tissue that has already developed.

For this reason, persistent chest fullness after weight loss does not automatically confirm gynecomastia, but it may justify a professional examination.

Family History and Genetics

Certain inherited conditions may increase the likelihood of hormonal abnormalities associated with gynecomastia.

Examples include genetic or chromosomal conditions that affect testosterone production or androgen activity. Klinefelter syndrome is one recognized condition associated with low testosterone and male breast development.

A family history of gynecomastia does not necessarily mean that the condition will occur. However, family history may help a doctor identify possible genetic, hormonal, or breast-related risk factors.

What Are the Symptoms of Gynecomastia?

Gynecomastia symptoms vary depending on the amount of tissue, how quickly it develops, and whether one or both breasts are affected.

The most common sign is enlargement of the tissue beneath the nipple or areola.

Early Signs to Watch For

Possible early symptoms include:

• A firm or rubbery area beneath the nipple.

• Enlargement of one or both breasts.

• Tenderness or sensitivity.

• Mild soreness when clothing touches the chest.

• Uneven breast appearance.

• Puffy or enlarged nipples.

• A movable disc-like area of tissue beneath the areola.

Recent or rapidly developing gynecomastia may be more tender than long-standing tissue.

Some descriptions refer to stages of gynecomastia based on the amount of enlargement, excess skin, and changes in chest contour. These grading systems are primarily used by clinicians to describe severity and assist with treatment planning; they do not explain the underlying cause.

When Symptoms May Require Medical Attention

Although gynecomastia is usually benign, certain signs should be evaluated promptly.

Seek medical advice if you notice:

• A hard, fixed, or irregular breast lump.

• Rapid or unexplained enlargement.

• Significant pain.

• Nipple discharge, especially if bloody.

• Nipple retraction.

• Skin dimpling, ulceration, or persistent redness.

• A lump located away from the nipple.

• Enlargement of lymph nodes in the armpit.

• A testicular lump, swelling, or change in size.

• Unexplained weight loss or other systemic symptoms.

A sudden change affecting only one breast should also be assessed. These symptoms do not necessarily indicate cancer, but evaluation is important to rule out other causes.

Discover Trusted Medical Information

Read our comprehensive guide to learn about gynecomastia, its risk factors, common signs, and when it may be time to seek medical advice.

How Is Gynecomastia Diagnosed?

A gynecomastia diagnosis is usually based on a medical history and physical examination. Additional testing may be recommended if the cause is unclear or if the doctor identifies unusual features.

For patients considering specialist evaluation, the Plastic Surgery Department in Sharjah may be a relevant option when gynecomastia requires further assessment or treatment planning.

Physical Examination

During the examination, the doctor may assess:

• The size and consistency of the breast tissue.

• Whether one or both breasts are affected.

• The position of the tissue in relation to the nipple.

• Tenderness or pain.

• Skin and nipple changes.

• Enlarged lymph nodes.

• Signs of excess fatty tissue.

• Testicular size, symmetry, or abnormalities.

• Evidence of liver, thyroid, or hormonal disease.

True gynecomastia commonly feels like a firm or rubbery disc beneath the nipple. Pseudogynecomastia tends to feel softer and more evenly distributed.

Medical History Review

The physician may ask about:

• When the enlargement began.

• Whether the tissue is painful or changing.

• Current and previous medications.

• Prescription and non-prescription supplements.

• Anabolic steroid or hormone use.

• Alcohol and recreational drug use.

• Weight changes.

• Symptoms of low testosterone.

• Liver, kidney, thyroid, or testicular conditions.

• Fertility or sexual health concerns.

• Family history of hormonal conditions or breast cancer.

Honest information about medications, supplements, and substance use helps the clinician identify potential causes and avoid unnecessary tests.

Imaging and Laboratory Tests

Not every patient requires imaging or blood tests.

Testing may be recommended when gynecomastia develops suddenly, persists without an obvious explanation, appears unusual during examination, or is accompanied by other symptoms.

Possible tests include:

• Blood tests to evaluate testosterone, estrogen, thyroid function, liver function, kidney function, or other hormones.

• Testicular ultrasound if a testicular abnormality is suspected.

• Breast ultrasound or mammography if the physical findings are uncertain or concerning.

• Additional imaging when an underlying tumor or organ condition is suspected.

• Biopsy when imaging or examination identifies a suspicious mass.

The purpose of testing is not only to confirm gynecomastia, but also to identify or exclude an underlying condition.

Gynecomastia vs. Pseudogynecomastia: What’s the Difference?

Gynecomastia and pseudogynecomastia can produce a similar chest appearance, but they involve different tissues and may require different approaches.

Key Physical Differences

Gynecomastia

Involves glandular breast tissue.

Often feels firm or rubbery.

Commonly centered beneath the nipple.

May cause tenderness.

May persist despite weight loss.

Pseudogynecomastia

Involves mainly fatty tissue.

Usually feels soft and diffuse.

Often spread more evenly across the chest.

Usually not tender.

Often improves with overall fat loss.

Visual appearance alone may not be enough to distinguish between them, particularly when both glandular tissue and excess fat are present.

Why an Accurate Diagnosis Matters

An accurate diagnosis helps determine whether the enlargement is caused by:

• Normal hormonal development.

• Excess body fat.

• Medication or substance use.

• An endocrine disorder.

• Chronic illness.

• A testicular or other tumor.

• Another breast condition.

Weight management may improve pseudogynecomastia but may have a limited effect on established glandular tissue. Conversely, assuming that all chest enlargement is true gynecomastia may lead someone to overlook the role of body weight or another treatable factor.

A proper diagnosis also ensures that suspicious symptoms are investigated rather than dismissed as a cosmetic concern.

Can Gynecomastia Be Prevented?

Not every case of gynecomastia can be prevented. Hormonal changes during infancy, puberty, or aging may occur naturally.

However, certain steps may reduce avoidable risk:

• Avoid anabolic steroids and non-prescribed hormones.

• Avoid recreational drugs linked to hormonal changes.

• Limit excessive alcohol consumption.

• Review supplements carefully.

• Maintain a healthy body weight.

• Manage chronic medical conditions.

• Take prescription medications only as directed.

• Speak with a doctor if a medication appears to cause breast enlargement.

Never stop a prescribed medication without medical advice. A doctor can determine whether the medication is likely to be involved and whether a safer alternative is available.

Regular medical care may also help identify thyroid, liver, kidney, testicular, or hormonal conditions before they cause more noticeable symptoms.

FAQs

What causes gynecomastia in males?

Gynecomastia in males is most commonly associated with a change in the balance between estrogen and testosterone activity. It may occur naturally during puberty or aging or be related to medications, anabolic steroids, chronic illness, low testosterone, thyroid disease, liver or kidney disease, substance use, or, rarely, a hormone-producing tumor. In some cases, no specific cause is identified.

How can a man tell if he has gynecomastia?

True gynecomastia often feels like a firm or rubbery disc of tissue beneath the nipple. The area may be tender, particularly when the tissue develops recently. Chest fat is usually softer and distributed more broadly. Because self-examination cannot always distinguish glandular tissue from fat or another breast condition, a clinician should assess persistent or concerning changes.

Is gynecomastia a serious medical condition?

Gynecomastia itself is usually benign and is not generally considered dangerous. However, it may occasionally indicate an underlying hormonal disorder, medication effect, chronic disease, or another condition that requires attention. It can also cause significant emotional distress or affect confidence and quality of life.

When should someone seek medical evaluation for gynecomastia?

Medical evaluation is recommended when chest enlargement appears suddenly, persists, causes significant pain, or affects only one side. Prompt assessment is particularly important if there is a hard lump, nipple discharge, nipple retraction, skin changes, enlarged lymph nodes, testicular symptoms, or unexplained systemic symptoms.

Learn More About Gynecomastia in Men

Gynecomastia in men is commonly related to hormonal changes, but medications, health conditions, body composition, and other factors may also contribute. Because true gynecomastia can resemble excess chest fat or, less commonly, another breast condition, professional evaluation is the most reliable way to confirm the diagnosis.

Patients can also review Our Doctors at the Plastic Surgery Clinics to learn more about the specialists who may be involved in evaluating and managing gynecomastia.

For those looking for specialist care, University Hospital Sharjah can also be considered when seeking medical evaluation for persistent or concerning chest enlargement.

Understanding the possible gynecomastia causes, recognizing early symptoms, and knowing when to seek medical advice can help individuals make informed decisions about their health.

Explore our expert resources to understand the causes, symptoms, diagnosis, and key facts about gynecomastia.