Edema is a medical condition characterized by an abnormal accumulation of fluid in the body's tissues, leading to swelling. It can occur in various parts of the body, including the legs, ankles, and feet, and may result from factors such as injury, inflammation, or underlying health issues like heart or kidney problems. There are different types of edema, including peripheral edema, which affects the limbs, and pulmonary edema, which involves fluid in the lungs. Treatment often focuses on addressing the underlying cause, and may include medications, lifestyle changes, or dietary adjustments to reduce fluid retention.