What physical sign may indicate a person is experiencing respiratory distress?

A person experiencing respiratory distress frequently exhibits difficulty breathing, which is a primary indicator of a problem with the respiratory system. This difficulty can manifest in various ways, such as shortness of breath, labored breathing, or a noticeable struggle to inhale or exhale. These signs suggest that the body is not receiving adequate oxygen or is struggling to remove carbon dioxide effectively, leading to a state of respiratory distress.

The other options do not align with the symptoms of respiratory distress. Sleeping quietly implies that the individual is in a stable state, while increased energy levels are generally associated with good health and adequate oxygenation. Excessive sweating can occur in various conditions but is not a definitive sign of respiratory distress by itself; it is usually accompanied by other symptoms. Thus, difficulty breathing distinctly marks the experience of someone facing respiratory distress and is a crucial sign for lifeguards or first responders to identify.