Injury guide

UPDATED JUN 2026

Part of the Allergan Breast Implant investigation

The short answer

Breast implant illness (BII) is a constellation of systemic symptoms — fatigue, brain fog, joint pain, hair loss — reported by implant patients. Unlike BIA-ALCL, BII is not yet a formally recognized diagnosis, but BII plaintiffs with Allergan BIOCELL implants are included in MDL 2921 litigation.

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What Is Breast Implant Illness?

Breast implant illness (BII) describes a pattern of systemic symptoms that some women with breast implants — both textured and smooth — report and attribute to their implants. Common symptoms include severe chronic fatigue, joint and muscle pain throughout the body, cognitive impairment (brain fog, difficulty concentrating), hair loss, skin rashes, dry eyes and mouth, anxiety and depression, and autoimmune-like conditions such as Hashimoto's thyroiditis or lupus-like presentations. BII symptoms can begin months or years after implant placement and often resolve or improve after explantation, though not always completely.

BII vs. BIA-ALCL — A Critical Legal Distinction

BII and BIA-ALCL are completely different conditions with different legal trajectories. BIA-ALCL is a confirmed lymphoma with a definitive causal link to textured implants — particularly Allergan BIOCELL — that is recognized by the FDA, WHO, and the medical community. BIA-ALCL cases have strong scientific causation foundations and the clearest path to compensation in MDL 2921. BII, by contrast, is not a single formally recognized medical diagnosis by the FDA or NIH as of 2026. The constellation of symptoms has not been attributed to a single disease mechanism, and the causal link between implants and systemic symptoms remains scientifically contested. This does not mean BII claims have no merit — women are genuinely suffering — but it means BII claims face greater legal challenges on causation and require more individualized expert testimony. Women with BII and Allergan BIOCELL implants should still consult an attorney, as the MDL includes BII claimants and litigation strategy continues to evolve.

Who Qualifies for a BII Claim in MDL 2921?

To have a BII claim evaluated in MDL 2921, you generally must have: Allergan BIOCELL textured breast implants placed before the July 2019 recall; documented systemic symptoms consistent with BII that your physicians have evaluated; and evidence that your symptoms are not better explained by an independent medical condition. Explantation that resulted in significant symptom improvement can be a strong supporting factor. BII claims that can be tied specifically to BIOCELL's macro-texture (on the theory that the inflammatory response it induces is greater than smooth implants) have a stronger litigation posture than generic BII claims against all implant manufacturers. An attorney will evaluate your symptom documentation, medical history, and explant outcome to advise on the strength of a BII claim.

FAQ

Frequently Asked Questions

12 QUESTIONS

BIA-ALCL stands for breast implant-associated anaplastic large cell lymphoma. It is a rare cancer of the immune system — specifically a T-cell lymphoma — that develops in the fluid or scar tissue capsule surrounding a breast implant, not in the breast tissue itself. The FDA has definitively established that BIA-ALCL is associated with textured breast implant surfaces, and Allergan's BIOCELL macro-textured surface in particular. As of June 2023, 1,079 of 1,264 globally reported BIA-ALCL cases (85%) involved Allergan BIOCELL implants. The FDA determined that women with Allergan BIOCELL implants face approximately a 6x higher risk of developing BIA-ALCL compared to women with implants from other manufacturers. The working hypothesis is that the BIOCELL surface's macro-texture creates a chronic inflammatory micro-environment that, over years, can trigger malignant T-cell transformation. This is why the recall targeted Allergan's BIOCELL surface specifically, not breast implants generally.

The full investigation

Part of the Allergan Breast Implant Investigation