Edema is the excess fluid trapped in the tissues of our body. There are 4 major pathological reasons of edema and all of them are discussed individually in this introductory video of chapter number 4. Timeline: 0:00 Introduction 1:00 Overview 2:25 Edema 3:43 Water 4:55 Increased Hydrostatic Pressure 6:32 Reduced Plasmic Oncotic Pressure 7:25 Lymphatic Obstruction 8:05 Sodium Retention 8:45 Inflammation