Why Gynecomastia Develops, and When It Needs Investigating Before Anything Else

Written by Dr. Ashutosh A Shah, M.B.B.S., M.S., M.Ch., D.N.B., Board Certified Plastic and Reconstructive Surgeon, Elegance Clinic, Surat. Reg. no. [REG NO]. 22+ years in plastic and reconstructive surgery.

Medically reviewed by Dr. Ashutosh A Shah · Published 28 September 2026 · Last reviewed 28 September 2026

Gynecomastia causes come down to a shift in the balance between oestrogen and androgen activity, producing glandular breast tissue in males. It is common and usually self-limiting in newborns and at puberty. In adults it can reflect medication, or a condition affecting the liver, thyroid, kidneys or testes.

Most pages on this subject treat gynecomastia as something to be removed. That is sometimes the right answer and it is never the first question.

The first question is why the tissue is there, because in a proportion of men the answer is a medicine they are taking or a condition nobody has looked for yet. This page is about that stage: what is expected, what is worth excluding, and which findings mean tests rather than reassurance.

What is gynecomastia at tissue level?

It is glandular breast tissue, present in a male chest. The NHS describes gynaecomastia simply as "where men have bigger breasts than usual".

The word matters because it is not a description of size or shape. It describes what the tissue actually is, and that is what separates it from fat sitting in the same area. Those two need telling apart before anything else is decided, and that is covered on the post about whether it is gland or chest fat. This page assumes that question has been asked and moves on to why the gland is there.

What is the hormonal balance behind it?

Breast tissue in both sexes responds to a balance between oestrogen activity, which encourages it, and androgen activity, which opposes it. Gynecomastia is what happens when that balance tips towards oestrogen.

The balance can tip for several different reasons, and they are worth separating because they lead to completely different conclusions:

• Normal developmental change. The balance shifts at certain life stages by itself. Nothing is wrong.
• Something added. A medicine, a substance or a supplement that affects the balance directly.
• Something not working. An organ whose job includes handling hormones, such as the liver, or a gland producing too much or too little.

Everything else on this page is about working out which of those three applies, because the answer changes what should happen next more than the size of the tissue does.

Which life stages is it expected in?

Three, and in two of them no cause is looked for because the cause is the life stage itself.

1. Newborn babies. The NHS attributes this to "the effect of pregnancy hormones on some newborn babies". It is transient.
2. Puberty. The NHS names hormone changes "during puberty" among the common situations.
3. Older adulthood. The NHS names hormone changes "in men aged over 50".

The useful thing about that list is what falls between the entries. A man in his twenties or thirties developing new breast tissue is not in an expected life stage, and that is the situation where looking for a cause is most worthwhile.

Puberty: why does it usually settle, and how long is too long?

It settles because the hormonal shift that caused it is itself temporary. The NHS states that when gynaecomastia "happens in newborn babies, or when it's caused by puberty, it usually goes away by itself over time".

Two things worth saying to a teenager or a parent, and the second is the one that gets missed:

• Waiting is a legitimate plan, not a fobbing off. It is what the guidance describes, and intervening early in something that resolves by itself is the worse error.
• Persisting is a reason to be seen, not a reason to keep waiting longer. Tissue that has been present a long time behaves differently from tissue that is still changing, and that changes what the options are.

There is no universal cut-off, which is why this page does not publish one. How long it has been there, whether it is still changing, and where the boy is in puberty are things a clinician assesses together rather than against a date.

Which medicines and substances are associated with it?

Several, and this is the single most useful section for an adult reader, because a medicine is a cause that can often be addressed without surgery.

Do not stop any prescribed medicine on the basis of this page. That is not a formality. Some of the medicines on this list are treating conditions where stopping abruptly is dangerous. The action is to raise it with whoever prescribes it.

The NHS Scotland clinical pathway for gynaecomastia lists the drug causes as "antioestrogens, spironolactone, calcium channel blockers, proton pump inhibitors, cimetidine, allopurinol, digoxin, opioids, anabolic steroids and cannabis".

The same pathway lists protein supplements, alcohol and obesity alongside them, and the NHS names "drug use, including anabolic steroids" separately.

Three observations about that list that are worth more than the list itself:

• Several are extremely common medicines. Blood pressure tablets and stomach acid medicines are taken by a great many people, most of whom will never develop this.
• Protein supplements appear on a clinical pathway. That surprises people, and it is worth mentioning at a consultation rather than assuming it is irrelevant.
• Anabolic steroid use is the one men least often volunteer, and it is among the most directly relevant. Nobody in a consultation is going to react to it, and not saying it wastes the appointment.

Which medical conditions are worth excluding?

Several, spread across different body systems, which is why assessment does not stop at the chest.

The NHS names "conditions such as an overactive thyroid, kidney disease, or cirrhosis". The NHS Scotland pathway lists a fuller set, and it is reproduced here as the source gives it rather than filtered.

That table is not a list of things you probably have. It is the list a clinician works through, and most men reach the end of it with nothing found, which is itself a useful result rather than a wasted appointment.

Which features mean investigation rather than reassurance?

Specific findings, which both sources state plainly and neither explains at length. They are reproduced here the same way.

The NHS advises seeing a GP if you:

• Have "pain in your breast or nipple that is not going away".
• Have "a lump in your breast or nipple".
• Notice "any changes in the skin of your breast or nipple, such as a rash, dimpling, or redness".

The NHS Scotland pathway adds the findings that lead to a breast unit referral rather than to routine management: a specific lump within the breast tissue as opposed to a generalised swelling, and "nipple inversion, nipple discharge or distortion".

These are findings that change what happens next. They are listed so that you recognise them and act, not so that you interpret them. Interpretation is what the assessment is for.

Why are one sided, hard, fixed or discharging different?

Because typical gynecomastia has a particular character, and these features depart from it.

Gynecomastia is usually a generalised swelling of tissue centred behind the nipple, and it is commonly present on both sides even when one is more noticeable than the other. A discrete lump that can be defined separately from the surrounding tissue is a different finding, whichever side it is on.

That is why the pathway distinguishes "specific lumps within breast tissue" from generalised swelling, and treats the first as a reason for referral. The same applies to a nipple that has become inverted, distorted or is discharging, none of which are features of ordinary gynecomastia.

If any of that describes what you are looking at, the useful next step is an appointment rather than more reading.

What does an assessment usually involve?

A history, an examination that includes more than the chest, and blood tests where no cause is already obvious.

On the history, the pathway says it should cover "drugs (prescribed or otherwise), alcohol, protein supplements, liver disease, testicular issues and obesity". Prescribed or otherwise is doing quiet work in that sentence and it is worth answering honestly.

On the examination, the pathway is specific in a way almost no clinic page repeats:

"Testicular examination should routinely be included as part of the assessment process in Primary Care", checking for atrophy, absence or a lump.

That is not an unusual request or an over-cautious one. It is the standard, it follows directly from the testes being the main source of androgen activity, and a gynecomastia assessment that skips it is incomplete.

On tests, where no cause has been identified the pathway suggests kidney and liver function, thyroid function, hormone levels including testosterone, prolactin and the pituitary hormones, and tumour markers. Imaging is not routine: the pathway reserves ultrasound for cases where a specific lump is present, and suggests mammography for men over forty.

No values or ranges are given on this page, deliberately. What a result means depends on the rest of the picture, and reading a number against a range from a website is how people frighten themselves incorrectly in both directions.

When does it resolve without treatment?

Most reliably when it belongs to a life stage, and sometimes when a cause is identified and removed.

The NHS position on the developmental forms is clear, and it is quoted above: newborn and pubertal gynaecomastia usually goes away by itself over time. No figure is attached to that in the source, and none is invented here.

The second route is different. Where a medicine or substance is identified as the likely cause, addressing it, under the direction of whoever prescribed it, may change the situation. Whether the tissue then settles depends on how long it has been present, which is a consultation question rather than a website one.

What does not resolve on its own is long-standing established tissue in an adult with no reversible cause. That is the group for whom the discussion turns to treatment, and it is a much smaller group than the one currently being sold surgery.

Why does the cause change whether surgery is the answer?

Because removing tissue does not address anything upstream of it, and if something upstream is still operating, the situation has not actually been dealt with.

Three illustrations of the same principle:

• If a medicine is contributing, that is a conversation with the prescriber first. Operating without having that conversation means operating with the cause still in place.
• If a systemic condition is behind it, that condition needs identifying for its own sake, entirely separately from the chest. It is the more important finding of the two.
• If it is pubertal and still evolving, the tissue may settle on its own, and intervening during that window is the wrong order.

None of that means surgery is the wrong answer. For a great many men with established tissue and no reversible cause, it is the answer. It means the sequence is assessment first, and a clinic that offers a date before it has asked about your medicines has the sequence backwards.

Whether what you have is gland or fat, and what treatment follows, is covered on the gynecomastia or chest fat page. The different presentations are described under gynecomastia types.

How is this assessed at Gynecomastia India, Surat?

By taking the history and doing the examination before discussing what to do, in that order, including the parts of the examination that are not the chest.

In our practice in Surat, the most common version of this is a man in his thirties who has assumed for years that this was simply his build, and who is taking a medicine that appears on the list in section 5 without ever having connected the two. Sometimes it is the cause and sometimes it is coincidence. It is always worth establishing which.

The second most common is a teenager brought by a parent who wants it dealt with before a wedding or before college. The honest answer there is often that waiting is the correct plan, which is not what anyone came to hear.

Where an assessment points towards a systemic cause or a finding that needs a breast unit, that referral is the outcome rather than a detour. Common questions are answered under frequently asked questions.
 

Next step

If you are taking any regular medicine, bring the names with you rather than trying to remember them, and expect the examination to include more than your chest. Book an assessment with Dr. Ashutosh Shah at Elegance Clinic, Surat. If you have noticed a lump, a change in the nipple, or skin changes, arrange to be seen promptly rather than waiting for an elective appointment.

This article is for education and is not a substitute for medical assessment. It describes causes and assessment as set out in published NHS guidance and does not diagnose anything. Do not start, stop or change any prescribed medicine on the basis of this page: if you think a medicine may be relevant, raise it with the doctor who prescribed it. Please discuss your own situation with a qualified clinician.