If you’ve noticed that your breasts appear unusually close together or lack a natural cleavage, you may be experiencing a condition known as synomastia. Sometimes called “fused breasts”, this relatively uncommon issue can affect not only the appearance of your chest but also how you feel in your own body.

As a consultant plastic surgeon specialising in breast procedures, I often work with women who are looking for answers and solutions. This article will help you understand what synomastia is, what causes it, and how surgery can help restore a more natural breast shape and separation—bringing greater confidence and comfort.

What Is Synomastia?

Synomastia is a condition in which there is no visible separation between the breasts. Instead, the skin and breast tissue extend across the middle of the chest (the sternum), creating one continuous mound.

It’s important to distinguish synomastia from simply having breasts that sit close together. In synomastia, there’s an actual connection—either visible or felt—between the two breasts, often caused by an abnormal development of tissue.

What Causes Synomastia?

Synomastia can occur for a number of reasons, although it’s not always clear-cut. Common contributing factors include:

• Congenital factors – Many cases are present from birth, linked to how breast tissue forms during early development.
• Genetics – Some people may be more likely to develop synomastia due to hereditary traits.
• Connective tissue differences – Variations in how the connective tissues form in the chest can lead to tissue merging.
• Hormonal changes – Shifts during puberty or other life stages might contribute, although they are unlikely to be the sole cause.

It’s worth noting that lifestyle choices or weight fluctuations don’t typically cause synomastia—though they can influence how prominent it appears.

Signs and Effects of Synomastia

Women with synomastia often face both physical and emotional challenges, such as:

• A visible band of skin or tissue joining the breasts
• A single, wide breast mound without a defined cleavage
• Difficulty finding bras and clothes that fit properly
• Skin irritation or discomfort where the breasts meet
• Feeling self-conscious, especially in swimwear or fitted clothing

While synomastia is rarely a health concern, the emotional impact can be significant. Many women describe feeling frustrated, embarrassed, or simply unlike themselves.

How Can Surgery Help?

If synomastia is affecting your confidence or comfort, surgery offers a safe and effective solution. The aim is to create natural-looking breast separation, improve contour, and help you feel more in harmony with your body.

Each surgical approach is tailored to your individual anatomy and preferences, but common techniques include:

Direct excision – Carefully removing the skin and tissue connecting the breasts. Incisions are discreetly placed to minimise visible scarring.

• Liposuction – If excess fat is contributing to the fusion, targeted liposuction can help refine the area and better define the cleavage.
• Breast implants – If desired, implants can be added to enhance shape, volume, and definition during the same procedure.
• Skin flaps and redraping – In more complex cases, advanced techniques are used to reposition skin and tissue for the best possible result.

What to Expect from Surgery and Recovery

Before the procedure, you’ll have a thorough consultation to discuss your concerns, medical history, and desired outcomes. A bespoke surgical plan will then be developed based on your needs.

Surgery is usually carried out under general anaesthetic. Afterward, you can expect some swelling, bruising, and mild discomfort, which can be well-managed with medication. You’ll receive detailed instructions on wound care, activity levels, and the use of supportive garments.

Recovery time varies depending on the procedure, but most women return to their usual routines within a few weeks. Final results will become more apparent as the swelling subsides and your body heals over the following months.

Regaining Confidence and Comfort

Choosing to address synomastia is a deeply personal decision—and one that can be truly transformative. Beyond the physical changes, many women experience a profound improvement in their self-image and overall wellbeing.

If you think you may have synomastia and are considering surgical correction, I encourage you to book a confidential consultation. We’ll explore your options together and design a treatment plan that helps you feel confident, comfortable, and truly yourself.