The inframammary fold (IMF) is the natural crease where the lower edge of the breast meets the chest wall. It acts as the foundation of the breast, defining where the breast sits and how its lower curve looks. In breast surgery, the fold is a key landmark: it is a common site for the incision, it guides implant position, and a fold that is too high, too tight, uneven or weakened can affect the result.
Anatomy of the fold
The fold is not simply a skin crease. It is formed by a band of connective tissue and ligament-like fibres that anchor the skin of the lower breast to the deeper layers of the chest wall. This structure supports the weight of the breast and creates the defined curve beneath it. In most women, the fold sits roughly level with the fifth or sixth rib, though its height, depth and shape vary considerably between individuals and between the two sides of the same person.
Normal variation
- Height: one fold often sits slightly higher than the other, which contributes to natural breast asymmetry.
- Definition: some folds are deep and sharp, others soft and barely visible.
- Width: the fold can be wide and gently curved or shorter and more constricted.
- Change over time: pregnancy, weight change and ageing can stretch the supporting tissues, allowing the breast to descend below the fold.
Small differences are entirely normal and rarely noticed by anyone other than the person themselves.
The fold in breast augmentation
Most breast augmentations are carried out through an incision placed in or just above the fold, because the scar is hidden in the natural crease and the surgeon has direct access to create the implant pocket. Accurate planning of the new fold position is important. A larger implant has a greater lower-pole height, so the fold may need to be lowered slightly to keep the nipple centred on the breast. Mr Nassab measures the distance from the nipple to the fold and the width of the breast to decide whether the fold should stay where it is or be carefully adjusted.
When the fold causes problems
- Double bubble: if the fold is lowered but the original crease persists, a visible line can appear across the lower breast.
- Bottoming out: if the supporting tissues weaken, the implant can drift below the fold, making the nipple sit too high.
- Asymmetric folds: uneven folds before surgery can be exaggerated by implants unless they are recognised and planned for.
- Scar visibility: an incision placed too high or too low can sit outside the crease and be more noticeable.
These problems are uncommon but may require revision surgery to reinforce or reposition the fold.
Tuberous breasts and a high fold
In tuberous (constricted) breasts, the fold is often high and tight, the lower part of the breast is underdeveloped and the areola may appear enlarged. Correction usually involves releasing and lowering the fold, reshaping the breast tissue from beneath and, in many cases, placing an implant to fill the lower pole. There is no dedicated page for tuberous breasts, but the approach is discussed as part of breast augmentation planning.
The fold in lifts and reductions
In a breast lift or reduction, the fold is a reference point for positioning the nipple and determining how much tissue and skin to remove. The horizontal part of an anchor-pattern scar sits along the fold. Where the breast hangs well below the fold, a breast lift or augmentation mastopexy is usually needed, because an implant alone cannot lift the nipple back above the crease.
How the fold is protected
Careful pocket creation, choosing an implant that matches the width and elasticity of your tissues, supportive garments after surgery and avoiding heavy lifting early on all help protect the fold. Where the tissues are weak, internal stitches can reinforce the new fold line. Breast augmentation costs from £8,500 and augmentation mastopexy from £12,500; the £150 consultation is separate. Cosmetic surgery is for adults aged 18 and over.
Frequently Asked Questions
Is it normal for my breast folds to be uneven?
Yes. Many women have one fold slightly higher than the other. It is usually assessed and taken into account when planning surgery.
Why is the implant incision made in the fold?
The scar sits in a natural crease where it is usually well hidden, and the approach gives the surgeon good control when creating the implant pocket.
What is a double bubble?
It is a visible line across the lower breast when an implant sits below the original fold. It can often be improved with revision surgery.
Can the fold be lowered?
Yes. Lowering the fold is sometimes needed for larger implants or tuberous breasts, and it is planned carefully to avoid a double bubble.
Related Guides
- Breast Asymmetry Correction Recovery
- Breast Asymmetry Correction: Risks and Safety
- Breast Asymmetry Correction: Questions to Ask
- Is Breast Augmentation Painful?
- Breast Augmentation Risks and Safety
- Who Is a Good Candidate for Breast Augmentation?
- Breast Augmentation: Questions to Ask Your Surgeon
- Choosing a Breast Augmentation Surgeon in the UK
