Lethargy, or sluggishness, refers to a state of reduced energy and alertness. Individuals experiencing lethargy may feel tired, weak, or unmotivated, making it difficult to engage in daily activities. This condition can be caused by various factors, including lack of sleep, poor nutrition, or underlying health issues. In some cases, lethargy can be a symptom of medical conditions such as depression, hypothyroidism, or chronic fatigue syndrome. It is important to identify the underlying cause to address the issue effectively. Lifestyle changes, such as improved diet and regular exercise, can help alleviate feelings of lethargy.