Capsular contracture
Your body forms a layer of scar tissue around any implant. That is normal and happens to everyone. Capsular contracture is what it is called when that layer thickens and tightens enough to change how the breast feels, looks, or hurts.
What capsular contracture is
When any foreign object is placed in the body, the body walls it off with scar tissue. For a breast implant that wall is called the capsule, and forming one is the expected response, not a complication. In most people the capsule stays thin and soft and you never know it is there.
In some people the capsule thickens and contracts. As it tightens it squeezes the implant, which makes the breast feel firm, pushes it into a rounder and often higher position, and in more severe cases causes pain. That is capsular contracture.
Schematic drawings to show the difference in principle. They are simplified, not to scale, and do not depict a patient or a result.
Capsule formation around an implant is a normal physiological response. Capsular contracture — thickening and tightening of that capsule — is one of the most common reasons people need further surgery after breast implants, and it is a recognised complication rather than a controversial one.
How common is it?
Reported rates vary so widely between studies that a single figure would mislead you. Rates differ depending on whether implants were placed for cosmetic augmentation or for reconstruction after mastectomy, whether radiotherapy was involved, how long the follow-up ran, and how the researchers graded severity. Published figures range from low single-digit percentages in some cosmetic series to more than one in five in reconstruction patients who had radiotherapy.
Risk accumulates with time rather than being fixed at surgery. This is one of the reasons the FDA requires implants to carry a boxed warning stating they are not lifetime devices and that complication risk increases the longer they remain in place.
Why it happens
There is no single agreed cause, and it is likely that several factors contribute differently in different people.
Bacterial biofilm on the implant surface is the most studied hypothesis. Low-grade bacterial contamination at the time of surgery is thought to provoke a chronic inflammatory response that drives capsule thickening. This is an active research area rather than a settled mechanism.
Other factors reported to be associated with higher rates include bleeding or haematoma around the implant, radiotherapy, and implant placement above rather than beneath the chest muscle. The strength of evidence differs between these and none of them explains every case.
What is worth understanding is that contracture is not caused by anything you did. It is not a sign you healed badly or looked after yourself poorly.
When it happens
Contracture can develop at any point. It is more frequently detected in the first year or two after surgery, but it also appears many years later, sometimes a decade or more after implants were placed. A late change in how your breast feels is worth having looked at rather than assumed to be unrelated.
A new firmness or change in shape years after surgery has more than one possible explanation, and some of them matter. Our patient safety page covers which changes should be seen promptly.
In this section
How it relates to removal
Capsular contracture is one of the clearest medical reasons for implant removal, and one of the situations where insurance or a provincial health plan is more likely to contribute. Where contracture is the reason for surgery, the capsule itself is usually removed rather than left in place — our page on capsule removal technique explains the difference between the approaches, and the cost page covers what tends to be funded.
- U.S. Food and Drug Administration. Breast implant labelling recommendations, boxed warning and patient decision checklist, October 2021.
- Breast Surgery Collaborative Community. Consensus statement on breast implant capsulectomy definitions and management, 2024.