Water retention, also known as fluid retention or edema, occurs when excess fluid builds up in the body's tissues. This can lead to swelling, particularly in the legs, ankles, and feet. Various factors can contribute to water retention, including high salt intake, hormonal changes, and certain medical conditions. In some cases, water retention may be temporary and resolve on its own. However, persistent or severe water retention may require medical attention, as it can indicate underlying health issues such as heart disease, kidney problems, or liver disease. Maintaining a balanced diet and staying hydrated can help manage fluid levels in the body.