While not a formal diagnosis, an autoimmune dysfunction known as breast implant illness has gained traction

In 2016, when Britney Pollock was 26, she decided to get breast implants: 400 cubic cm of silicone, inserted under her pectoral muscles.

She “felt awesome” after the procedure, says Pollock, now 34 and a teacher based in California. “It just felt good to look good.”