How Do I Know My Breast Implants Have a Problem? Key Signs include changes in breast shape, firmness, position, or symmetry. Pain, swelling, redness, tenderness, or unusual sensitivity may also indicate a concern. Hardening around the implant, known as capsular contracture, can cause discomfort and distortion. Sudden size changes or fluid buildup should also be evaluated. If any unusual symptoms develop, consult a qualified medical professional for proper assessment and appropriate treatment options.