Edema, commonly known as swelling, is a medical condition where excess fluid gets trapped in your body's tissues. This condition can be caused by various health issues like heart disease, kidney disease, or even due to certain medications. It's often most noticeable in the hands, arms, feet, ankles, and legs, but can happen anywhere in the body. If left untreated, it can lead to painful inflammation and serious health complications. It's crucial to consult a doctor if you notice any persistent swelling.