Gynecomastia: why men develop breast tissue in midlife

Gland or fat?

True gynecomastia is growth of breast gland tissue. It usually feels like a rubbery or firm disc centered behind the nipple, may be tender, and can affect one or both sides. Fat in the chest area, sometimes called pseudogynecomastia, looks similar but is soft, has no distinct edge and is rarely tender.

Telling the two apart requires a physical exam, sometimes with ultrasound or mammography. The distinction matters because the causes and treatment differ.

Why it happens

Breast tissue in men responds to the balance between estrogen, which stimulates it, and testosterone, which counteracts it. MedlinePlus lists aging as one of the normal times this balance shifts. As testosterone gradually declines and body fat increases, more testosterone is converted to estrogen in fat tissue, tipping the balance.

Low testosterone from any cause, obesity, chronic liver disease, kidney failure, an overactive thyroid and, rarely, pituitary or testicular tumors can all contribute.

Medications and substances

Medications are a frequent and fixable cause. Examples include:

• Spironolactone and some other heart and blood pressure medicines
• Finasteride and dutasteride for prostate enlargement or hair loss
• Hormone therapy for prostate cancer
• Testosterone therapy and anabolic steroids, which can be converted to estrogen
• Some heartburn medicines, antidepressants, anxiety medicines, antifungals, antibiotics and HIV medicines
• Opioids
• Alcohol, marijuana, amphetamines, heroin and methadone
• Certain herbal products and topical products containing lavender or tea tree oil

When to see a doctor promptly

Breast cancer in men is uncommon, but it does occur. Get an in-person exam promptly for:

• A hard or firm lump, especially one that is off-center from the nipple or fixed in place
• A lump on one side only that is growing
• Nipple discharge, particularly bloody or dark, or a nipple that has turned inward
• Skin dimpling, redness, scaling or a sore over the breast
• A lump in the armpit or above the collarbone
• A testicular lump, swelling or change in size, which can rarely be linked to hormone-producing tumors
• Rapid, painful enlargement without an obvious medication cause

What testing can help

A physical exam is the first step, with ultrasound or mammogram when the exam is unclear or a lump is concerning. Blood tests look for hormonal and medical causes and may include a morning total testosterone (repeated if low), estradiol, LH and FSH, prolactin, hCG, liver and kidney function, and thyroid function.

In many men, the blood work is normal and the cause is a combination of age, body fat and medications. A low testosterone result should be confirmed and its cause understood before any treatment, because testosterone therapy itself can cause or worsen gynecomastia.

Treatment options in general terms

Often no treatment is needed beyond addressing the cause. A clinician may suggest switching a responsible medication where possible; do not stop any prescribed medicine on your own. Cutting alcohol and recreational drugs and reducing body fat can help. Treating an underlying condition such as hypogonadism, thyroid disease or liver disease may lead to improvement.

Recent, tender gynecomastia sometimes responds to medicines that block estrogen's effects, prescribed by a specialist. Long-standing gynecomastia tends to become fibrous and is less likely to shrink; surgery to remove gland tissue is an option for persistent or bothersome cases.

What it can feel like day to day

Beyond appearance, gynecomastia can cause tenderness when the chest is bumped, discomfort under a seatbelt, or self-consciousness at the gym or pool. Many men delay mentioning it out of embarrassment. It is a common, well-understood condition, and clinicians are used to discussing it. Note when you first noticed it, whether it is getting bigger, whether one or both sides are affected, and any medications or supplements started in the year before. That timeline is often the key to finding the cause.

Gynecomastia and testosterone therapy

Men on testosterone therapy can develop breast tenderness or enlargement because some testosterone is converted to estradiol. If this happens, the dose and monitoring are reviewed with the prescribing clinician. It is one of several reasons testosterone therapy requires regular follow-up, alongside monitoring hematocrit and PSA, and awareness that it suppresses sperm production.

How HealifyMD can help

A HealifyMD clinician can review your medications and symptoms, order hormone and organ-function labs, and evaluate whether low testosterone is part of the picture. If you are on testosterone therapy through HealifyMD, we monitor for breast changes and adjust treatment as needed. We do not perform breast exams or imaging, so any lump, discharge or skin change is referred for in-person evaluation first.