What condition is most closely associated with excessive fluid in the body's tissues?

Edema is characterized by the excessive accumulation of fluid in the body's tissues, leading to swelling. This condition can occur in various parts of the body, such as the arms, legs, and abdomen, and is often a result of conditions affecting the heart, kidneys, or liver, which may impair the body's ability to manage fluid balance.

In contrast, hemoptysis refers to the coughing up of blood, which is not related to fluid retention in tissues, while melena involves the passage of dark, tarry stools due to the presence of digested blood, and is associated with gastrointestinal bleeding. Constipation, on the other hand, is a condition characterized by infrequent or difficult bowel movements and does not involve fluid accumulation in bodily tissues. Hence, edema is the clear connection to excessive fluid in the body's tissues.