Fluid retention, also known as edema, occurs when excess fluid builds up in the body's tissues. This can lead to swelling, particularly in the legs, ankles, and feet. It can be caused by various factors, including a high-salt diet, certain medications, or underlying health conditions like heart or kidney disease. In some cases, fluid retention may be temporary and resolve on its own, while in others, it may require medical attention. Lifestyle changes, such as reducing salt intake and increasing physical activity, can help manage symptoms. If fluid retention persists, consulting a healthcare professional is recommended.