home > john casey article smallermediumlarger John Casey Writer, WebMD, Inc. John Casey is a freelance writer in New York City. STAY INFORMED Get the latest health and medical information delivered direct to your inbox! From Featured Centers Feeling Short of Breath? What Radiation Can Do For Cancer Top 3 Anaphylaxis Triggers Health Solutions From Our Sponsors Fight Metastatic Breast Cancer Knee Treatment Plan Exclusives What Does Psoriasis Look Like? How to Prevent Muscle Cramps Blood Clot? Know the Signs and Symptoms Allergy Triggers: Do You Know Yours?