We are pleased to announce the launch of the Mast Cell Diseases Patient and Provider Registry (MCD Registry)! The MCD Registry creates a platform for patients around the world to strengthen their voices and share information about mast cell diseases, diseases that cause symptoms in many organ systems and are often hard to diagnose. Mast cell diseases currently have no cure. Designed with the input of physicians, scientists, and patients, this global resource will provide data for researchers to use to advance drug development and treatment options to help improve mast cell disease patient care. Join now and let your data tell your story!