What is a primary symptom of fatigue?

The primary symptom of fatigue that is highlighted is the inability to focus or concentrate. Fatigue significantly impacts cognitive functions, leading to decreased alertness and impaired focus. When a person is fatigued, they may struggle to pay attention to details or maintain their concentration on tasks, which can be detrimental, especially in scenarios requiring safety and critical decision-making, such as in maritime operations.

In situations where focus is crucial, like operating a vessel or executing rescue missions, this symptom can lead to mistakes and dangerous outcomes. Understanding the symptoms of fatigue can help individuals recognize their limits and take necessary actions, such as resting or rotating duties, to maintain operational safety and efficiency.