Gigantomastia (macromastia): what it is, symptoms and treatment

Gigantomastia is a medical condition that, besides affecting the body, can have a significant emotional impact on those who live with it. If you have ever wondered what causes excessive growth of the breasts, how gigantomastia differs from macromastia or how it can be treated, this article from Clínica EGOS is for you. We explain it clearly and simply.

What is gigantomastia?

Gigantomastia is an abnormal, excessive growth of breast tissue. There is no consensus on the exact amount of enlargement that defines the condition, but it is generally considered gigantomastia when the size of the breasts significantly interferes with quality of life.

Important: gigantomastia is not the same as having large breasts. It is growth out of proportion, which in some cases can appear quickly.

Gigantomastia and macromastia: are they the same?

Both terms are used in practice, and they refer to the same problem to different degrees. A 2026 review with meta-analysis in Aesthetic Plastic Surgery (Johow and colleagues) defines macromastia as excessive growth of breast tissue that affects quality of life, and gigantomastia as its severe form.

There is no universal definition either. A 2008 review in the Journal of Plastic, Reconstructive & Aesthetic Surgery (Dancey and colleagues) explains that many authors speak of gigantomastia when more than 1,500 grams per breast has to be removed, but that the literature gives figures between 0.8 and 2 kilos, or even a D cup size. The authors themselves point out that this is a postoperative definition, of little use in deciding on treatment, and propose classifying gigantomastia according to its cause, its treatment and its prognosis.

Symptoms of gigantomastia and macromastia

This condition can cause back, neck and shoulder pain; difficulty breathing; skin problems, such as irritation or infections under the breasts; and limitations on physical activity. It can also lead to low self-esteem or social discomfort.

The ASPS (American Society of Plastic Surgeons) adds the grooves left by bra straps on the shoulders and the difficulty of leading an active life because of the weight of the breast tissue. According to the ASPS, the emotional discomfort that often accompanies very large breasts can be as significant as the physical pain.

Causes of gigantomastia and macromastia

The causes are not always clear, but specialists have identified several factors that may contribute to its appearance. Hormonal changes are one of the main causes: puberty, with an abnormal increase in oestrogen and progesterone; pregnancy, in which the body produces more hormones to prepare for breastfeeding; and, in some rare cases, the menopause.

Genetic factors also play a part: some women have a predisposition, and if there is a family history the risk increases. Certain hormonal medications, such as hormone replacement therapy or treatments for reproductive problems, can trigger the condition. In very rare cases, autoimmune disorders such as lupus or rheumatoid arthritis may be associated. And cases with no clear cause have been recorded, which is called idiopathic gigantomastia.

What types of gigantomastia are there?

Not all gigantomastias are the same. According to their origin, they are classified into several types. Juvenile gigantomastia appears during puberty, when the breasts grow rapidly and uncontrollably, and it can affect self-esteem. Gestational gigantomastia occurs during pregnancy: the breasts can increase by several sizes within weeks and cause intense physical discomfort. Drug-induced gigantomastia is triggered as a side effect of certain hormonal drugs. And idiopathic gigantomastia is diagnosed when there is no obvious cause; sometimes neither hormonal nor genetic studies show any abnormality.

Treatment of gigantomastia and macromastia

Treatment depends on the degree of involvement and on the underlying cause. In general, the options include medical treatment, surgery and psychological support.

Medical treatment

In macromastia, when a hormonal or drug-related cause is identified, an attempt can be made to control breast growth by stopping the related medication, with regulating hormonal therapies and, in the case of autoimmune diseases, with anti-inflammatory treatments. However, in many cases these measures are not enough to reverse breast growth that has already occurred, whether macromastia or gigantomastia.

Surgical breast reduction (reduction mammoplasty)

Surgery is the treatment considered to relieve the physical symptoms. Breast reduction consists of removing the excess breast tissue, fat and skin and reshaping the size and shape of the bust. SECPRE explains that it is done under general anaesthesia, that it lasts between two and four hours and that the incisions are usually anchor-shaped: around the areola, vertically down to the fold and horizontally along that fold. The excess skin, fat and gland tissue is removed, and the nipple and areola are repositioned.

In most cases the areola stays attached to its blood vessels and nerves; in very large reductions, the ASPS explains that it is sometimes necessary to detach the nipple-areola complex and place it in a higher position.

A 2012 systematic review in Plastic and Reconstructive Surgery (Singh and Losken) concludes that women who have the operation improve in musculoskeletal pain, headaches, sleep and breathing, and that the psychological benefits include greater self-esteem and quality of life, and less anxiety and depression. Another, from 2026 (Johow and colleagues), reports that breast reduction is the reference treatment for relieving symptoms in gigantomastia.

Among the benefits usually sought are relief from back, neck and shoulder pain, more freedom to take part in physical activity and better posture.

Considerations

It is advisable to wait until after pregnancy, if possible, to avoid further changes: SECPRE does not recommend this procedure for women who intend to breastfeed after a pregnancy, and points out that the ability to breastfeed may be affected after a reduction. Like all surgery, it has risks, which the surgeon explains before you decide. According to SECPRE, in most cases the surgeon waits until the breast has fully developed. When, besides volume, the breast is sagging, the ASPS indicates that the reduction can be combined with a breast lift (mastopexy), and if one breast is larger than the other you have a guide on breast asymmetry.

Psychological treatment

Gigantomastia can deeply affect self-esteem and body image. Many patients find the support of a psychologist who specialises in body health or image therapy useful.

Recovery after a breast reduction for macromastia

SECPRE describes that, after the surgery, it is normal to feel tired for a few days, but that you can lead an almost normal life within 24-48 hours. In a reduction the hospital stay usually extends to two or three days, according to the same source. According to that source, stitches are removed from the first week and up to the second, the swelling takes between 3 and 6 weeks to go down completely and the return to work usually comes at 2 or 3 weeks, with strenuous physical activity limited for a time.

The ASPS reminds us that swelling and bruising may at first hide the final result, and that complete recovery can take several months. The scars from a reduction are visible and do not disappear, although they can be hidden under a bra or bikini, according to SECPRE; the ASPS adds that over time they usually soften. Over the years, moreover, the breasts can change through ageing, weight variations and hormonal factors.

Does social security cover breast reduction?

According to SECPRE, breast reduction is only included in the Spanish social security benefits in extreme cases, a condition known as gigantomastia. If you have doubts about your case, the surgeon explains at the consultation whether it fits that category.

When to seek medical help?

If you notice rapid, disproportionate growth of your breasts, accompanied by pain or skin changes, and you suspect macromastia or gigantomastia, it is advisable to consult a specialist. An early diagnosis can improve the prognosis and avoid complications. The appropriate specialist is usually a reconstructive plastic surgeon, an endocrinologist (if a hormonal cause is suspected) or a gynaecologist with experience in breast conditions.

The ASPS notes that a reduction is usually considered when there is pain in the back, neck or shoulders, bra-strap grooves, skin irritation under the breasts or difficulty with physical activity.

Informative text about gigantomastia. It is not a diagnosis and does not replace the assessment of a healthcare professional, and the result of an operation varies from one patient to another. Clínica EGOS.