Breast Implant Illness – Causes, Symptoms and Treatments

As with any surgical procedure, breast augmentation carries certain risks. It’s an invasive form of cosmetic surgery involving the surgical placement of breast implants, and while it’s considered a very safe procedure in the UK with a low overall complication rate, breast implant illness (BII) has received significant media attention in recent years, and many patients understandably wonder whether it’s a recognised complication of implant surgery. This guide covers what BII is, what’s currently known about its possible causes, the symptoms reported, how common it might be, how it’s assessed and treated, and where the evidence genuinely stands.

What Is Breast Implant Illness?

Breast Implant Illness (BII) is a term used to describe a wide range of symptoms that some individuals report after receiving breast implants. These symptoms vary considerably and aren’t limited to any one part of the body. Discussion of a possible link between breast implants and these kinds of symptoms dates back as far as the 1960s, and the condition is sometimes also referred to by the medical term autoimmune/inflammatory syndrome induced by adjuvants (ASIA).

Despite decades of discussion, BII remains a topic that divides opinion, both online and within the plastic surgery community itself. Social media, in particular, is full of posts and personal accounts about BII, but not all of this information is medically accurate, and there isn’t yet a clear consensus — even among UK specialists — on whether BII represents a distinct, definable condition or whether reported symptoms are attributable to other causes.

Researchers and cosmetic surgeons around the world continue to investigate BII, studying different implant types — saline versus silicone gel, smooth versus textured surfaces — to understand whether any specific factors are contributing to reported symptoms. At present, BII isn’t officially recognised as a formal medical diagnosis, largely because there isn’t yet enough dedicated scientific research treating it as a distinct condition in its own right.

That said, regulatory attention has increased. In March 2019, the U.S. Food and Drug Administration (FDA) held a public meeting specifically to discuss the risks and benefits of breast implants for both cosmetic and reconstructive use, including a discussion of BII. In September 2020, the FDA went on to recommend updated labelling for breast implants, including “black box” warnings intended to give patients clearer, more balanced information about both the benefits and risks before deciding to proceed. While not yet a formally recognised diagnosis, BII is clearly becoming a more prominent part of the conversation around breast implants.

Is BII Real? Where Does the Evidence Currently Stand?

Whether BII is a “real,” distinctly definable condition is a genuinely open question within the medical community, and it’s fair to say opinion is divided. BII isn’t officially recognised as a formal diagnosis at this time, but a growing number of studies have begun exploring whether reported symptoms are meaningfully connected to breast implants — some research has found that a proportion of women who have implants removed report improvement in their symptoms afterwards, though results across studies vary and aren’t universally consistent.

BII is increasingly discussed at academic conferences and in medical literature, and regulatory bodies including the FDA have taken active steps to better understand the risks associated with implants, including BII specifically. Taken together, it’s reasonable to say that while BII isn’t yet an officially recognised diagnosis, the volume of patient-reported symptoms isn’t something to dismiss outright either. Ongoing research is needed to draw firmer conclusions about the condition, how common it genuinely is, and the most effective approaches to diagnosis and treatment.

What Might Cause Breast Implant Illness?

The exact cause of BII remains unclear, and no single explanation has been confirmed. Several theories are currently being explored by researchers, and you may come across some of the more specific medical terms used to describe them:

• Immune response / Human Adjuvant Disease — the theory that the body’s immune system reacts to the implant as a foreign material, treating it as an “adjuvant” that makes the immune system more active and potentially triggers systemic symptoms in susceptible individuals. ASIA (autoimmune/inflammatory syndrome induced by adjuvants) is a broader version of this same theory, covering reactions to other implanted materials too, not just breast implants.
• Silicone leakage / silicone-induced incompatibility — the possibility that trace amounts of silicone may migrate beyond the implant capsule over time, and that some individuals may simply be biologically incompatible with silicone as a material, though the clinical significance of this remains under investigation.
• Bacterial biofilm, chronic infection, or allergy — some researchers have proposed that biofilms (thin layers of bacteria that can form on the surface of any implanted medical device) may play a role in triggering symptoms. Biofilms have also been linked to other implant-related complications, including capsular contracture and BIA-ALCL. A related theory suggests that yeast within saline implants, or bacteria around any implant type, could cause the kind of chronic low-grade inflammation associated with BII symptoms. Some research has also suggested that textured implant surfaces may carry a comparatively higher risk of associated systemic symptoms than smooth surfaces — one of several reasons the industry has moved away from textured implants in recent years.
• Heavy metal exposure — a less commonly discussed theory proposes that trace materials used in implant manufacturing (or, separately, in tattoo ink) could contain heavy metals that contribute to symptoms in some individuals. This theory has considerably less research behind it than the others.
• Genetic predisposition — the theory that some individuals may be more biologically susceptible to developing symptoms in response to an implanted foreign material than others.

None of these theories has been conclusively proven, and research into the underlying mechanism is ongoing. It’s likely that BII, if it represents a genuine distinct condition, involves more than one of these mechanisms working together, and that susceptibility varies considerably between individuals.

Potential Symptoms of Breast Implant Illness

BII is still being actively studied, and while the full picture isn’t yet understood, certain symptoms are more commonly reported than others. It’s worth remembering that many of these symptoms can also be explained by other, more common medical conditions, and are often short-lived. If you have any concerns after breast augmentation, we’d always recommend a follow-up appointment with your surgeon for a proper clinical assessment.

A decline in mental wellbeing

Some patients report difficulty concentrating, increased irritability, forgetfulness, or short- and long-term memory issues — sometimes described as “brain fog.”

Fatigue and lethargy

A lack of energy is commonly reported, with some patients describing persistent tiredness that affects their ability to carry out normal daily activities.

Sleep disruption and insomnia

Changes to sleeping habits are common in the early recovery period after breast augmentation — often simply due to needing to sleep on your back, which may be unfamiliar if you normally sleep on your side or front. Some patients report more persistent changes, including difficulty falling or staying asleep.

Hormonal changes

Some patients report symptoms suggestive of hormonal disruption, including hair loss, weight changes, reduced libido, symptoms resembling early menopause, or changes to the menstrual cycle.

Skin concerns

Changes in skin pigmentation or texture, and increased sensitivity to allergic reactions such as persistent itchiness or dry skin, have been reported by some patients.

Gastrointestinal symptoms

Abdominal discomfort, loose stools, or constipation have been reported, sometimes indistinguishable from symptoms of irritable bowel syndrome.

Mood and sleep changes

Some patients report mood changes including anxiety, low mood, or irritability, alongside sleep disturbances such as restlessness or vivid dreaming.

Breast-specific changes

Some patients report symptoms directly affecting the breast itself, including pain, swelling, changes in shape, redness, nipple discharge, or a sense of increased heaviness.

How Common Is Breast Implant Illness?

There’s no official, agreed count of how many women experience symptoms they attribute to BII — this is genuinely one of the open questions in the field. Some estimates suggest a range anywhere from a small percentage up to around 20% of women with implants may report symptoms they associate with BII, but this figure should be treated with real caution: without a formal diagnostic definition, studies measuring “BII” are essentially counting self-reported symptom clusters rather than a confirmed, consistently diagnosed condition, so the true figure is genuinely uncertain.

Not every woman with breast implants will experience BII, and risk is likely influenced by a combination of factors, including implant type and composition, individual health, and — based on some research — a personal or family history of autoimmune conditions or anxiety. The role of other factors, including high social media engagement around the topic and the presence of tattoos, has also been studied, though the findings here remain preliminary and shouldn’t be treated as established fact.

How Is Breast Implant Illness Diagnosed?

BII isn’t officially recognised as a formal medical condition, so there’s no dedicated diagnostic test or defined checklist a doctor can use to confirm it. In practice, a surgeon typically assesses whether other, better-understood conditions could explain your symptoms first — a process of exclusion rather than direct confirmation.

Before considering implant removal for suspected BII, it’s important to rule out other causes through appropriate testing, which may include a complete blood count, thyroid function tests, liver and kidney function tests, and breast imaging where clinically indicated. This thorough approach helps ensure that any decision to proceed with implant removal is genuinely well-founded, rather than based on assumption.

How Is Breast Implant Illness Different From Other Breast Implant Complications?

It’s worth clearly distinguishing BII from other, better-understood implant-related conditions, since they’re sometimes confused. Capsular contracture is a well-recognised, physically diagnosable tightening of scar tissue around the implant, distinct from BII’s more diffuse, systemic symptom pattern. BIA-ALCL is a rare, specific type of lymphoma with defined diagnostic criteria and a confirmed (if rare) association with certain textured implant surfaces — again, distinct from BII, which currently has no formal diagnostic pathway at all. Implant rupture is a mechanical failure of the implant shell, identifiable on imaging, and separate from the systemic symptom pattern associated with BII. A localised implant infection is also distinct — typically presenting with persistent breast pain, fever or chills, pus or discharge from the surgical site, localised redness, and noticeable swelling, and is treated with antibiotics or, in more serious cases, implant removal. Understanding these distinctions matters, since the appropriate assessment and treatment pathway differs for each.

Who Should Consider Explant Surgery for BII?

There’s no single test that confirms BII, so the decision to proceed with implant removal is a personal one, made in partnership with your surgeon after other causes have been reasonably excluded. Women who tend to consider explant surgery are typically those experiencing a persistent cluster of symptoms — often several from the categories above — that developed after augmentation and haven’t been explained by other medical investigation. It’s a decision worth taking time over: a thorough consultation, a candid discussion of what surgery can and can’t guarantee, and realistic expectations about outcome all matter more than rushing toward removal. Many women report significant symptom improvement after explant, but this isn’t universal or guaranteed, and your surgeon should be honest with you about that uncertainty rather than overpromising. Symptom improvement timelines also vary considerably — some women notice relief within months of implant removal, while others report it taking a year or two to fully resolve, depending on factors including overall health, how completely the implant and capsule were removed, and how long the implants had been in place.

How Is Breast Implant Illness Treated?

Treatment for BII remains a genuinely debated topic among medical professionals, largely because the condition itself isn’t formally recognised, and there’s no single standardised treatment protocol. That said, several approaches are commonly considered.

Implant removal (explant) is the approach most commonly associated with symptom improvement, using either a partial capsulectomy or an en bloc capsulectomy.

En bloc capsulectomy involves removing the implant and the entire surrounding capsule together, as a single unit. Our philosophy at Centre for Surgery is straightforward: when a foreign object like a breast implant is inserted, the body’s natural response is to form a protective layer of scar tissue — the capsule — around it. Since BII symptoms could potentially relate to the implant itself, surface contaminants, or the capsule, removing all of these together in one procedure minimises the body’s ongoing exposure to any potential irritant. For implants with a textured surface specifically, en bloc removal also eliminates any risk of BIA-ALCL developing within the retained capsule tissue.

However, en bloc capsulectomy is a more technically demanding procedure than a standard capsulectomy, and carries its own specific risks — including bleeding (haematoma), pneumothorax (collapsed lung), and contour irregularities, particularly in patients with thinner tissue. Given these risks, it’s important that the procedure is performed by an experienced specialist surgeon.

Partial capsulectomy, by contrast, removes the implant along with only part of the surrounding capsule. Some research suggests this approach can achieve broadly similar symptom relief to en bloc removal for many patients, with a comparatively lower risk profile — though the right choice for you depends on your individual circumstances, discussed properly with your surgeon at consultation. Many women choose to combine implant removal with a breast lift in the same procedure, since breasts often appear deflated once the implant is removed.

Beyond surgery, some patients explore additional supportive approaches alongside or instead of implant removal, though these aren’t a substitute for it if surgery is genuinely indicated:

• Medical management — treating any underlying or coexisting medical conditions, or managing specific symptoms with appropriate medication where relevant.
• Lifestyle changes — adjustments to diet, exercise, sleep, and stress management, which some women find helps alleviate symptoms alongside other treatment.
• Complementary approaches — some women explore acupuncture, massage therapy, or other complementary therapies for symptom management. The evidence base for these specifically in the context of BII is limited, and they’re best considered supportive rather than curative.

If you’re exploring information about BII, it’s worth being cautious about sourcing — social media can be a valuable place to hear other patients’ experiences, but it’s also a common source of misinformation. Speaking directly with an experienced, qualified surgeon remains the most reliable way to get accurate, individually relevant information, regardless of what’s ultimately found to be causing your symptoms.

Supporting Your Recovery

Whether or not you proceed with implant removal, several practical steps can help if you suspect you’re experiencing BII:

• Seek expert advice — consult a specialist with genuine experience assessing and managing BII, who can properly evaluate your symptoms and discuss realistic treatment options.
• Track your symptoms — keeping a record of what you’re experiencing, both before and after any treatment, is genuinely useful for you and your surgeon in understanding your specific pattern.
• Follow your post-surgery recovery plan closely if you proceed with explant surgery, including prescribed medications and gentle activity to support healing.
• Attend all follow-up appointments — ongoing monitoring after implant removal helps identify any lingering symptoms and confirms you’re recovering as expected.
• Look after your mental health alongside the physical process — living with unexplained symptoms can be genuinely difficult, and psychological support or counselling can be just as valuable as physical treatment.

Some patients also find additional support through connecting with others who’ve had similar experiences, and staying informed as medical understanding of BII continues to evolve.

What Are the Medical Risks of Breast Augmentation?

Much remains unknown about whether BII exists as a clearly defined medical condition. Separately, breast augmentation is associated with certain recognised medical risks, which are considered minimal when the procedure is performed by an experienced consultant plastic surgeon:

• Capsular contracture
• Implant rupture
• Seroma
• Haematoma
• Changes in nipple or breast sensation
• Difficulty breastfeeding
• Excessive scarring
• Infection
• Interference with mammogram screening, requiring additional imaging views

What Are the Cosmetic Risks of Breast Augmentation?

Many patients are more familiar with the cosmetic risks of breast augmentation than the medical ones above. Dissatisfaction with results is often related to unrealistic expectations, or a mismatch between the outcome achieved and what the patient was hoping for. Recognised cosmetic complications include:

Implants too large or too small — the most common cosmetic concern, relative to the patient’s goals. We always recommend trying on implant sizers during consultation to build a clear picture of your preferred size, matched appropriately to your chest wall anatomy.

Implants sitting too high — often simply due to normal early-recovery swelling rather than true malposition; implants typically settle into their correct position over the first four weeks.

Implants sitting too low — sometimes called “bottoming out,” more common in patients with minimal natural breast tissue to support the implant, or with excessively large, heavier implants.

Implants positioned too close together or too far apart — too-close placement can result in symmastia, which can be difficult to correct; overly wide placement is similarly related to surgical planning.

Frequently Asked Questions

Choosing an Implant: Our Approach at Centre for Surgery

Rather than presenting a wide menu of implant types and letting patients navigate the trade-offs alone, Centre for Surgery uses Silimed silicone implants exclusively, following a clinical review of surface technology and safety evidence, including the surface-related factors discussed above. We don’t use saline implants (no longer used in UK augmentation) or textured surfaces. Every implant we use is CE-marked and covered by Silimed’s replacement guarantee. Your surgeon will still discuss implant size, profile, and placement in detail at consultation to match your anatomy and goals — but the underlying material and surface technology reflects a single, carefully considered clinical standard rather than an open menu of trade-offs.

Book a Consultation at Centre for Surgery

Recognising potential clinical features that might suggest a complication after breast augmentation is genuinely important — though it’s worth remembering that the overall risk of complications remains low when surgery is performed by an experienced consultant plastic surgeon. We’d always recommend thorough research and asking plenty of questions at consultation before deciding whether to proceed with breast augmentation.

At Centre for Surgery, breast procedures are performed by GMC-registered plastic surgeons, at our CQC-regulated Baker Street facility, under TIVA (Total Intravenous Anaesthesia). If you have concerns about symptoms following breast augmentation, or would like to discuss your options, get in touch on 020 7993 4849 to book a consultation, or complete the contact form below.

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