True gynaecomastia is enlargement of the breast gland tissue in men, usually felt as a firm, rubbery disc under the nipple. Chest fat, or pseudogynaecomastia, is soft fat without gland enlargement, often linked to weight. Many men have a mixture of both. The difference matters because fat may respond to weight loss, while gland tissue usually does not, and surgery is planned differently.
What is the difference?
- True gynaecomastia: growth of glandular breast tissue, caused by an imbalance between oestrogen and testosterone effects. It feels firm or rubbery and is centred behind the nipple and areola, which may look puffy.
- Pseudogynaecomastia: extra fat on the chest without gland enlargement. It feels soft, spreads more evenly across the chest and often reduces with weight loss.
- Mixed: many men have both gland and fat.
How can I tell which I have?
A simple guide is to feel the area behind the nipple. A firm, disc-like lump directly behind the nipple suggests gland tissue, while a soft, even fullness suggests fat. Chest fat usually goes along with fat elsewhere on the body; gynaecomastia can occur in slim, muscular men. A self-check is only a guide, though. A proper examination, and sometimes an ultrasound scan, is needed to be sure.
What causes gynaecomastia?
- Normal hormonal stages: temporary breast enlargement is common in newborns, during puberty and in older age as hormone levels change. Puberty-related enlargement often settles by itself.
- Anabolic steroids and bodybuilding supplements: a common cause in adult men, which may not fully reverse after stopping.
- Medications: some medicines, including certain treatments for prostate conditions, heart conditions, stomach ulcers and mental health conditions, can cause breast enlargement. Do not stop a prescribed medicine without speaking to your doctor.
- Alcohol and recreational drugs, including cannabis.
- Medical conditions: such as liver or kidney disease, an overactive thyroid, and, rarely, hormone-producing tumours, including of the testicles.
- Weight gain: fat tissue converts some testosterone into oestrogen.
Often, no specific cause is found.
When to see a GP
See your GP if your chest enlargement is new, rapidly growing, painful or tender, or if you are unsure of the cause, so that underlying conditions and medicines can be reviewed. See your GP promptly if you notice a hard lump on one side only, especially if it is off-centre from the nipple, fixed, or accompanied by nipple discharge, bleeding, an inverted nipple, skin changes or a lump in the armpit. Men can get breast cancer, and although it is uncommon, these signs need checking. Also see your GP if you notice a lump or swelling in a testicle.
Non-surgical options
If chest fat is the main issue, losing weight through diet and exercise may reduce it considerably. Chest exercises build the pectoral muscle, which can improve the overall shape but will not remove gland tissue. Treating the underlying cause, such as stopping anabolic steroids or reviewing medicines with your doctor, can help, especially early on. Compression vests can smooth the outline under clothing. Established glandular tissue usually does not go away by itself.
Gynaecomastia surgery
Surgery is tailored to what is causing the fullness.
- Liposuction removes excess fat and is often enough for pseudogynaecomastia.
- Gland excision removes firm glandular tissue through a small incision at the lower edge of the areola.
- Combined approach: most men have liposuction and gland removal together.
- Skin reduction: in severe cases or after major weight loss, excess skin may need removing, with longer scars.
Surgery is best undertaken once your weight is stable and any cause has been addressed. It is for adults aged 18 and over.
Recovery, risks and cost
Most men wear a compression vest for around six weeks, return to desk-based work after about one week and avoid chest exercise and heavy lifting for around six weeks. Swelling settles over several months. Risks include bleeding or haematoma, infection, seroma, contour irregularities, asymmetry, changes in nipple sensation, a sunken appearance under the nipple if too much tissue is removed, scarring and recurrence, particularly if steroid use continues. Gynaecomastia surgery costs from £9,500, and the £150 consultation is charged separately.
Frequently Asked Questions
Will losing weight get rid of gynaecomastia?
Weight loss can reduce chest fat but usually does not remove true glandular tissue, which is why some men still have puffy nipples after losing weight.
Can gynaecomastia come back after surgery?
Removed gland tissue does not usually regrow, but recurrence can happen if the cause, such as steroid use or weight gain, continues.
Is gynaecomastia caused by steroids permanent?
It may improve after stopping, especially if caught early, but established gland tissue often remains and may need surgery.
Should I worry about a lump on one side of my chest?
A hard lump on one side, especially if it is not directly behind the nipple, should be checked promptly by your GP.
Can exercise fix man boobs?
Chest exercise builds muscle and weight loss reduces fat, but neither removes established gland tissue.
