A ganglion cyst is a non-cancerous, fluid-filled swelling that usually develops near joints or tendons, most often in the wrist or hand. Traditionally, it was sometimes called a “Bible cyst” because people used to strike it with a heavy book (often a Bible) to rupture it — a practice no longer recommended due to risks of injury. This information is for educational purposes only and is not a substitute for professional medical advice. Consult a healthcare provider for personalized guidance. #medi