Which symptom indicates fluid accumulation in the lungs?

Shortness of breath is a significant indicator of fluid accumulation in the lungs, also known as pulmonary edema. When fluid collects in the air sacs of the lungs, it interferes with normal gas exchange, making it difficult for the individual to breathe efficiently. As a result, the body often responds with an increased respiratory rate or effort, leading to sensations of breathlessness or difficulty in breathing, especially during exertion or when lying down.

In this context, increased energy would generally not be associated with fluid accumulation, as the condition typically results in fatigue and decreased stamina. A dry cough may occur in various respiratory conditions but does not specifically indicate fluid presence. Similarly, clear nasal discharge is typically associated with upper respiratory issues, not with the fluid accumulation that occurs in the lungs. Thus, shortness of breath stands out as the most direct and relevant symptom linking to this condition.