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Overview

What Is Gynecomastia?

Gynecomastia is a noncancerous enlargement of male breast gland tissue caused by an imbalance between estrogen and testosterone effects. It can affect one breast or both breasts, and the amount of enlargement may be different on each side. The condition can occur in newborns, adolescents going through puberty, and older adults. This male breast gynecomastia may improve on its own or may need evaluation if it persists or changes.

Symptoms

Symptoms of Gynecomastia

  • Enlargement of breast tissue on one or both sides of the chest.
  • A firm or rubbery lump beneath the nipple (subareolar tissue).
  • Tenderness or soreness in the enlarged breast area.
  • Increased nipple sensitivity, especially with pressure or rubbing.
  • Uneven enlargement, with one breast larger or more noticeable than the other.

Important

Unusual breast findings need assessment

A new hard, fixed, or clearly one-sided lump, especially when it is not centered beneath the nipple, should be examined by a clinician. Nipple discharge also needs medical assessment because these findings may not represent typical gynecomastia.

Causes

Causes of Gynecomastia

Gynecomastia develops when the effects of estrogen outweigh the effects of testosterone in breast tissue. This does not mean that every case has one clearly identifiable cause; normal life-stage changes, health conditions, medicines, and substances can all contribute.

  • Puberty or aging can temporarily or gradually change the balance of estrogen and testosterone.
  • Obesity can increase fatty tissue and alter hormone activity, contributing to breast gland enlargement.
  • Low testosterone or other conditions that affect sex hormones can cause gynecomastia in men.
  • Thyroid disease or liver disease can interfere with hormone production or breakdown.
  • Kidney disease can affect hormone balance and may be associated with breast enlargement.
  • Testicular or adrenal conditions can change hormone levels and contribute to gynecomastia.
  • Medicines such as some antiandrogens, blood pressure medicines, or other prescription drugs may contribute in selected people.
  • Anabolic steroids, cannabis, and alcohol can affect hormone balance and may contribute to male gynecomastia.

Risk Factors

Risk Factors for Gynecomastia

Factor typeExamples
Nonmodifiable or physiologicInfancy, puberty, and older age can involve normal hormone changes that increase the likelihood of gynecomastia.
Health-relatedLow testosterone, thyroid or liver disease, kidney disease, and testicular or adrenal conditions may affect hormone balance.
Potentially modifiableObesity, anabolic steroid use, alcohol or recreational drug exposure, and some medicines may increase risk.
Medication-relatedSome prescription treatments can contribute to breast enlargement; medication changes should be discussed with a clinician.

Having a risk factor does not prove that it caused the condition. Some people develop gynecomastia in men without an obvious risk factor, while others may have more than one contributing factor.

Complications

Complications of Gynecomastia

  • Persistent tenderness or soreness can continue when glandular tissue remains enlarged.
  • Embarrassment or anxiety may make social, intimate, or clothing-related situations difficult.
  • Body-image concerns may affect confidence and emotional well-being.
  • An atypical breast mass may be evaluated late if it is incorrectly assumed to be typical gynecomastia.

When findings are unusual

Know which changes need prompt review

Gynecomastia itself is usually benign, but a hard fixed lump, skin changes, nipple retraction, or bloody nipple discharge should be assessed promptly. These findings do not automatically mean cancer, but they should not be assumed to be typical gynecomastia.

Diagnosis

How Gynecomastia Is Diagnosed

Diagnosis usually begins with questions about when the change started, symptoms, medicines, supplements, alcohol or drug use, health conditions, and puberty or aging. A clinician then examines the chest and may examine the testicles and look for other signs of hormonal disease. The examination helps distinguish glandular gynecomastia from chest fat and other breast conditions.

  • Blood tests may check hormone levels and kidney, liver, or thyroid function when an underlying cause is possible.
  • Ultrasound or mammography may be used when the breast finding is uncertain or has suspicious features.
  • Additional testing may be directed by the examination, medical history, or associated symptoms.

Treatment & Management

Gynecomastia Treatment and Management

CONSERVATIVE CARE

Watchful waiting may be appropriate when enlargement is recent, mild, or linked to puberty. Weight management can reduce excess chest fat, although it does not remove established glandular tissue, and treating an underlying disorder may allow the enlargement to improve.

ACTIVE TREATMENT

Persistent pain, distress, progressive enlargement, or a treatable cause may lead to medicine review or prescription treatment. Surgery may be considered when enlargement remains stable and bothersome despite appropriate evaluation and cause-directed care.

Medication and nonsurgical treatment

Prescription medicines may be considered early in selected cases, particularly when symptoms are recent, but they should be used only under clinical guidance. Do not self-start hormones, anti-estrogen medicines, or supplements. Evidence for over-the-counter products marketed as gynecomastia treatments is limited, and some may cause harm or interact with other medicines.

Prevention

Can Gynecomastia Be Prevented?

  • Avoid anabolic steroids and nonprescribed hormones, which can disrupt the balance of estrogen and testosterone.
  • Limit alcohol and avoid recreational drugs that may affect hormone balance or interact with medicines.
  • Maintain a healthy weight to reduce excess fatty tissue and related hormonal changes.
  • Review medicines and supplements with a clinician rather than stopping prescribed treatment independently.

Outlook and Prognosis

Outlook and Prognosis

Many cases, especially those related to puberty, improve over months to a few years as hormone levels change. Long-standing enlargement is less likely to resolve completely without treatment because the tissue may become more established. The outlook depends on age, cause, duration, underlying health, and whether the contributing factor can be treated.

Often temporary

Puberty-related enlargement may improve as hormones settle.

Variable course

The timeline depends on the cause and how long the tissue has been enlarged.

More persistent

Long-standing glandular tissue is less likely to disappear without treatment.

When Should You See a Doctor

When Should You See a Doctor for Gynecomastia?

  • Arrange a medical visit for new or persistent breast enlargement.
  • Seek evaluation for breast pain or tenderness that does not improve.
  • Arrange an assessment if the breast changes rapidly.
  • Have a one-sided lump examined, particularly if it is hard or fixed.
  • Report nipple discharge, especially bloody discharge.
  • Seek care for skin dimpling, ulceration, redness, or other skin changes.
  • Mention associated symptoms such as testicular swelling or unexplained weight loss.

Tests & Procedure

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Symptoms

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